How to block user agent com$" bad_bot_block With the start and end-of-string anchors in the regex you are bascially checking that the User-Agent string is exactly equal to "yandex. htaccess file: Deny from "User-Agent: <user-agent-string>" Replace <user-agent-string> with the actual user agent string you To block that specific user-agent in Apache config (or per-directory . htaccess file: Some malicious users will send requests from different IP addresses, but still using the same User-Agent for sending all of the requests. We can see the User Agent of the Users visited our site now in GA Behavior > Events > Top Events > Search for the Event Category (namend in Tag Manager (in our case "User Agent")) In the last step we exclude the User Agent from all our Propertys and Views. Cloudflare > Domain > Security > WAF. Below is a useful code block you can insert into. We then log it and drop it. The. 0 (Windows NT 6. You can read more about the robots exclusion protocol here. Note ^user_agent_name is a regular expression, so the caret means match any string starting with ^user_agent_name. 73 [en] (X11; U; Linux 2. RewriteEngine On RewriteCond %{HTTP_USER_AGENT} Googlebot [OR] RewriteCond %{HTTP_USER_AGENT} AdsBot-Google [OR] RewriteCond %{HTTP_USER_AGENT} msnbot [OR] RewriteCond I want to block empty user agents for bad-bot reasons. I want to block: Mozilla/5. php { return 408; } If you are using Apache web server, see How to block Bad Bots (User Agents) using . To use AWS WAF to block HTTP requests based on the user agent header, take one of the following actions: Use AWS Managed Rules to block requests that don't contain a user agent header. A second option is to use the SetEnvIfNoCase command. Edit It's hard to scale a user-agent based rule in nginx alone: You can use regex to match a number of user agents in the if block. How to block a browser User-Agent. Short version: try this: Mod_security blocking Googlebot is a "false positive", and usually those are fixed by creating an exception. Hi. On next page select following values. User-agent: * Disallow: *. As has been suggested you could "whitelist" Googlebot by it's User-Agent, but that would open a hole for anyone using a fake Googlebot User-Agent. Am I doing this right. My goal is to simply block requests that don't have a User-Agent header set. If traffic from some non-browser user agents is being erroneously blocked, you can create an exception by setting the offending AWS WAF Bot Control rule SignalNonBrowserUserAgent to Count and then combining the rule's labeling with your exception criteria. 12 [NC] RewriteRule ^ - [F,L] Every other user agent is forbidden with a 403. ) Are there any other ways to handle this flood of requests or do I have to just wait The rule that we will build will block log on by user agent strings that are not in use in our company, namely Windows, Windows 7, Firefox 63. I've added a request filtering rule, but I know it is still hitting the site because it shows up in Google Analytics. conf files. For example, most PC-based web browsers have extensions available that are capable of changing the browser's user-agent to any number of presets. htaccess Block Country from Visiting Website with . Also, my example uses Abort Request rather than custom response By blocking their User Agents, you will stop any traffic that contains the specified name in the user agent field. While conducting regular analysis of our customers’ Microsoft 365 audit logs, we noticed the user agent BAV2ROPC kept appearing. 0) Gecko/20100101 Firefox/13. User-agent: * Disallow: / Use the ’RewriteCond’ directive to specify the User-Agents you wish to block. 152, user agent stylesheet overwrite with Something odd is happening in my Chome 12. Use the OR flag on the RewriteCond directive. We receive a lot of requests regarding the addition of a specific user-agent to block bot requests by Imunify360 rules. 0 Block specific User Agent in ISAPI REWRITE 3. 1,310 5 5 gold badges 21 21 silver badges 37 37 bronze badges. Block or Allow Specific IP via . Block access based on: User-agent Header; Block request that: Matches the Pattern; Pattern (User-agent Header): ^$ Using: Regular Expression; How to block: Abort Request; Rule will be the same as other replies given with the caveat that you don't seem to be able to rename it. This article will go in-depth on how to block specific user agent(s) and referers on a NGINX or Apache web server. named SCspider, Textbot, and s2bot), do that with the . Fortunately, it is possible to block those bots based on their user-agent string. You can block any http user agents with GET / POST requests that scrape your content or try to exploit software vulnerability. 0 (compatible; ICS)" that apache eats through all the available memory. 0 and BAV2ROPC. Try instead something like this: RewriteCond %{HTTP_USER_AGENT} (. 0 (Linux; Android 4. Recommended Actions Enable an attack signature by going to: Security > Options > Application Security > Attack Signatures > Attack Signatures Summary : You may notice that some bots often visit and scan your website aggressively, which wastes a lot of web server resources. htaccess file: If you want to match an entire user-agent string then you can use the = (lexicographical string comparison for equality) prefix operator (together with double-quotes) on the CondPattern to test for an exact match. You can block visitors by User-Agent by going to. So I had this rule: RewriteCond %{HTTP_USER_AGENT} ^-?$ RewriteRule ^ - [F] Now one of our customers uses an RSS aggregator whose request for his feed comes in as a "-" user agent I want to block all requests with suspicious user-agent to access APIGW. 1. conf: SetEnvIfNoCase User-Agent "Mozilla/4. *$. 2; SGH-M919 Build/JDQ39) By following these steps, you can effectively use ’. I would like to know if there is a way to block all user-agents except the one that contains the word "chrome" using . Commented Mar 14, 2014 at 11:51. 12 [NC] RewriteRule ^ - [F,L] In my case, the first request (with the Mozilla User agent) was from an embedded webview. then it is preferred they don't crawl your site. After editing the ’. $ entry To achieve that, you need to change the Default web ACL action for requests that don't match any rules to Block, and then add your rule that allows access if user-agent match or contains what you want. blocking browser using user agent in squid proxy. How to make it so that if HTTP_USER_AGENT contains an entry from the listed keys. txt, and to avoid pointless server load (and log-file spamming) I'd like to prevent certain classes of request (in particular based on user-agent or very perhaps IP-address) from proceeding. What is user agent name? The user agent name indicates the software/browser that generated the user agent string. Below we will demonstrate how to block bad bots via their user agent. Improve this question. I dont know how to do. 0) like Gecko" bad_user Deny On the other hand, a user agent is simply a software package with the responsibility of retrieving, rendering and interacting with end users’ web content. The requested URL was to download a PDF file. As documentation says @pmFromFile "Performs a case-insensitive match of the provided phrases against the desired input value. The HTTP User-Agent header contains client information, such as the type and Fortunately, it is possible to block those bots based on their user-agent string. Block User Agent with iptables not working. 0", sorry for my noobish question :-) Thanks F5 Rocks, with the first log line I just wanted to get sure, that the rule hits at all (or maybe a previous match prevents this from hitting). Your regex code in general is wrong. 5 minutes ago, Chrome (Webkit) all of a sudden decided to insert extra css rules in my design: How To Set A Fake User-Agent In Scrapy There are a couple of ways to set new user agent for your spiders to use. Instead, block the offending IPs. 1. For example, if a user’s product were called I'm trying to globally block empty user agents from accessing sites on the server. Stack Exchange Network. Filter Type = Custom > Select the Event or Dimension > Type the User Agent to exclude. Everything was ok. I used something like this, but this works unfortunately only if the exact name is given. 15 i686)" [URL] In postman its just as easy, just tinker with the headers and params as I can't inspect User Agent Styles in Microsoft Edge developer tools. for example, for bing. If you still need to block multiple User-Agents (i. Then you want these rules in the htaccess of the directory you want to restrict: RewriteEngine On RewriteCond %{HTTP_USER_AGENT} !Lynx/2\. htaccess file for blocking a lot of the known bad bots and site rippers currently out there . *BingPreview. How to solve this is not a problem, but I am interested in the reason of this margin. In your screenshot IPS was already triggered on this traffic, depends on the signature, its worth to set it on prevent (or detect at first to understand which additional traffic falls under it) - this Block Hackers and Scrapers By User Agent. A first line of defense against bots and scraping is to check the User Agent header for being from one of the major browsers and block all non-browser user agents. 8dev\. 152 m user agent stylesheet overwrite it with display: block (still ok even if it's not mine) but on vista chrome version 25. net; Share. Blocking all bots. Thanks for the help! It was the upper case letter from "Mozilla/4. Enabling Bot Protection might not take care of it, I believe. On my windows seven chrome version 25. Click on the rule and User-agent: * Disallow: User-agent: MSNbot Disallow: / The above code allows all robots except MSNbot. A “user agent” is a software agent that is acting on behalf of a user. . Related Articles. , (and )). py file and add a new user agent: Attacks against Domain Specific Languages, EU Cybersecurity Laws, & Supply Chain Attacks How do i get this to change to: Vary: User-Agent:(c#. htaccess block from the link, which redirects requests from iPhone user agents to an iPhone specific site is: RewriteEngine on RewriteCond %{HTTP_USER_AGENT} iPhone RewriteCond %{REQUEST_URI} !^/my-iPhone-site/ RewriteRule . Try to block IP adresses instead. htaccess file. Is there any other method to block request with no user-agent? Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company How to block the User-Agent of a device or a bot accessing your website using the . No obvious way to disable them all either for testing purposes or to remove all margins and paddings from navigation uls and lis. Whether you are dealing with scrappers, spammy bots, or just unwanted traffic from known User-Agents, NGINX offers you a way to block them effectively. 1364. Use the following syntax. We are getting lots of requests with no user agent set. This config should do exactly what Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company How can I block GETs w/ no user agents? (anything that has no referral or user agent "-" "-", I'm assuming that's pretty unique to whatever script/bot the spammer is using. This article describes how to use FortiWeb advanced protection rules and policies to restrict access to web applications from certain browsers or block unknown browsers/user-agents. htaccess or Block User-Agent using Cloudflare. It checks the HTTP_USER_AGENT header of the incoming request to see if it matches the pattern ^. Optionally you can use \s or \s+ for spaces but . txt file as disallowed user agents (according to each AI company’s instructions. 0 IIS 10: How to Blocking via User-Agent. Basic Blocking Syntax. ) User-agent: anthropic-ai Disallow: / User-agent: Claude-Web Disallow: / User This example straight from the cURL docs on User Agents shows you how you can play around with setting the user agent via cli. Blacklist Certain User-Agents in Nginx. Web_Designer. htaccess file right click to edit the user agent configuration. 0?. 152 and mac chrome version 25. Then i think there, they are blocking the incoming cURL requests because when i test with the normal HTML <form>, it is working. 0 How can I block this with my nginx? I have no idea what to block, if this is an empty user agent or what. This will shore up our protections from in-country attacks. htaccess file: Deny from "User-Agent: <user-agent-string>" Replace <user-agent-string> with the actual user How do I block a user agent using nginx. I am seeing this same attack. You need to use directives in . Blocking IP addresses, User Agents or Referres may cause unforseen issues, since it’s easy to block more then expected. Tour Start here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site How To Block Bots By User-agent Why you should block some crawling bots . On this page, you can also add rules by clicking on “Edit expression” link, and then pasting RewriteCond %{HTTP_USER_AGENT} ^bot* RewriteCond %{HTTP_USER_AGENT} bot\* RewriteCond %{HTTP_USER_AGENT} bot[*] Here is the full . Otherwise, once we see "User Agent" but not the undesirable one, it . ". In these events you can also block users by their User-Agent strings. Understanding how to block requests by User-Agent is an important aspect of securing your web applications and managing traffic. Anyone can help me with this problem. This article will go in-depth on how to block specific user agent (s) and referers on a NGINX or Apache web server. I searched for it, but I only find solutions to set the margin zero, but I want to know why this margin is there. 0; GomezAgent 3. You have to use the . How to block a specific user agent in nginx config. asked Sep 22, 2015 at 9:08. You can do that by accessing the Rules tab of your WAF and scrolling down to this part: To block more than one User Agent (e. 12. 8\. This is what you need exactly. RuleList=DenyUserAgent (in the options section) (place in the end) [DenyUserAgent] DenyDataSection=Agent Strings ScanHeaders=User-Agent [Agent Strings] YisouSpider Maybe the word could give an explanation in the ini file. RewriteEngine On RewriteCond %{HTTP_USER_AGENT} spamcrawler [NC,OR] RewriteCond %{HTTP_USER_AGENT} spambot [NC,OR] RewriteRule . If you want to know what mod_security is and how it works you should start reading for ex Wondering how to block requests that have bad User Agent Header. RewriteEngine on RewriteCond %{HTTP_USER_AGENT} opera|firebox|foo|bar [NC] RewriteRule ^ - [F,L] This will forbid all requests to your site if HTTP_USER_AGENT matches the Condition pattern. 4k 93 93 gold badges 208 208 silver badges 266 266 bronze badges. Combine it with ’RewriteRule’ to enforce the block, usually by sending a 403 Forbidden response. The BrowserMatchNoCase allows case insensitive matches against the user agent. I'm trying to disable logging for certain user agents, unless I disable the main log for the site, it'll continue logging what I tell it not to for the user agents. I tend to suspect a browser or some exploit as a potential cause, given the pace of the attack, IP variability, and network speed differences. 1; WOW64; rv:28. Follow asked Apr 16, 2015 at 9:18. Share. Please help me create htaccess rules to block the user agents below. Skip to main content. Besides user-agent data, the directory also offers an IP verification option, allowing you to cross-verify an IP/User-Agent, thus helping to prevent impersonation attempts. Crawl-delay — Tells the User-agent to wait 10 seconds between each request to the server. Site owners can block user agents easily using CloudFlare Firewall Rules known to be associated with malicious activity, such as bots and scrapers. Add this code to disallow all bots: acl rule_name browser ^user_agent_name then. Back to Nginx htaccess config to block depending on browser agent how is the opposite done of this code ? for example inhibition of ^. com" (except that the . curl --user-agent "Mozilla/4. Yeah, that would block bad user agent strings, but I'm looking to take it a step further and auto-ban ips associated with the bad user agent strings, such that use of the user-agent string gets you banned from that point onwards on that ip. In this case block, close the site At the moment, for example, the Bytespider bot. Ask Question Asked 11 years, 6 months ago. 17. This piqued our interest not only because we were unsure of The Baidu spider (BaiduSpider user agent) can be a real pain to block, especially since it does not respect a robots. For example, a Googlebot (crawler) can use all this different user-agents: Block access based on: User-agent Header Block request that: Matches the Pattern Pattern (User-agent Header): *Googlebot* Using: Wildcards How to block: Abort Request Click OK when complete. 0; rv:11. The format of the user-agent string in HTTP is a list of product tokens (keywords) with optional comments. User-agent: MSNBot Disallow: / for google. Modified 11 years, 5 months ago. htaccess file) using mod_rewrite, you can do something like this: RewriteEngine On RewriteCond %{HTTP_USER_AGENT} "=Mozilla/5. Other than that, you may have to use scripts (php, ruby, python) for this. Web browsers from Android devices generally contain the keyword ‘Android’ (without quotes). The contains operator verifies whether the user-agent string contains the matching element. Then enter your pattern. So to sum it up, I have a log defined in my virtual block to log all of the traffic (I have it defined for every block, to make it neater and what not. And yes, they do have measures in place to block fake traffic, including bots and click farms. NOT (A AND B) == (NOT A) OR (NOT B), it is a boolean arithmetic. Here are the the user agents that i Select User-agent Header for the “block access based on” field. , cannot identify the specific, offending IPs), then use the Boolean operator “or” to separate each User-Agent. Here is. *|. txt file? This post explains how to block certain user-agent on nginx web server. * works too How is user agent used? User agents allow servers to identify key details about the client sending requests such as browser, OS, device type, etc. *DV. Sites may use this info to optimize content delivery or block unwanted traffic. Set New Default User-Agent The easiest way to change the default Scrapy user-agent is to set a default user-agent in your settings. htaccess’ file, You want to use an iRule to block HTTP requests with unwanted User-Agent headers. htaccess file to block that this particular user agent: The htaccess content should be: RewriteEngine On SetEnvIfNoCase User-Agent "Mozilla/5. For example: RewriteCond %{HTTP_USER_AGENT} "=This is the exact user-agent I want to block" RewriteRule ^ - [F] Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company Unfortunately no tool in cPanel allows you to directly block user agents or bad robots. You either need to backslash escape the spaces in the user-agent string, or enclose the entire user-agent (ie. I assume that you already have an Nginx web server up and running. To block acces to a specific file or folder, use. Add a comment | 3 I'm trying to block requests from a certain bot. htaccess. 1 so removing the + from your denyStrings section You can block AI crawlers by adding them to your site’s robots. We just trying to match against a collection of strings. 3. A user agent is a string of text that a web browser or other client software sends to a web server along with each request to identify itself and provide information about its capabilities. 27. Use custom rules to block requests with a specific user agent header. But not via cURL anyway. 8dev. Without the OR flag, the Description To block a Web Crawler or similar not desired requests that contain the same User-Agent string in their HTTP header, you can use custom attack signatures. g. Feb 14, 2021 #2. ^Mozilla I am transferring an Object Array. If they have the undesirable User Agent, we mark it as 0xBAD1 -- blaclisting it. txt tells crawlers that if they are not with google. Block a single bad User-Agent. I know there is a bunch of ways to do it, one is via Irule,and the others via ASM, I am not sure how to achieve it. I do not allow bots to access the pages unless they identify with a user-agent, I found most often the only things However, as with many HTTP request headers, a user-agent string can be manipulated with relatively little effort. All other bots are allowed to crawl everything except URLs whose paths start with /member, /cgi-bin/, or *. What I've been attempting to use (in a VirtualHost section) is the following: RewriteEngine on RewriteCond ${HTTP_USER_AGENT} ^$ RewriteRule . * I have defined the folowing css property div { display: block; } On opera/firefox/safari property is ok. In these events you can block users by their User-Agent strings. 2. User-agent: googlebot Disallow: / if you want block all bots. These are obviously not legit bots and you probably don’t want them sucking up your hosting resources. # START Blocking Bad Bots Options All -Indexes RewriteEngine on # Block Bad Bots & Scrapers SetEnvIfNoCase User-Agent "Aboundex" bad_bot SetEnvIfNoCase User-Agent "80legs" bad Some malicious users will send requests from different IP addresses, but still using the same User-Agent for sending all of the requests. ) Am I correct in thinking that by blocking the GET, it'll get rid of the POST? 3. CondPattern - 2nd argument to the RewriteCond directive) in double quotes. * is a wild card that matches anything. RewriteCond %{HTTP_USER_AGENT} ^. From Apache's docs, this should be dead simple. *$ [NC] RewriteRule . Also note that this is a regex by default, so any special/meta regex characters also need to be escaped (that includes . Onto the mystery: BAV2ROPC. But the most part of crawling bots is not helpful, moreover, they harm the site performance. The below examples demonstrate how to whitelist general types of browsers (eg mozilla or chrome), but the string I want to whitelist has / and (which breaks the nginx conf. By rotating your Playwright User Agent randomly, you can mimic user behavior, making it more challenging for websites to identify and block your automated activities. After Russia invaded Ukraine I noticed an increase in hacking bots using the Chrome 90 user How can I block some user agent at server level? For eg mj12bot? serpent_driver Well-Known Member. Below, you can find the detailed instructions on how to do it on a temporary basis (before rules update) and on a permanent basis. These rules apply to the entire domain instead of individual subdomains. 0) Gecko/20100101 Firefox/28. want to block user agents with just a hypen at a apache level, not htaccess. For example, how can I make rule to block all requests with user-agent as ``` "python-requests/2. Chrome/10. Consequently, I'd like to block all requests accompanied by this user agent, so I tried doing this in httpd. 2. – David Spector. conf files but does not understanding that what code need add in blacklist-user-agents. Here’s a simplified example of how to block a specific User-Agent: RewriteEngine On RewriteCond %{HTTP_USER_AGENT} harmfulbot [NC] RewriteRule I recommend against blocking User-Agents. The User Agent Blocking rules block specific browser or web application User-Agent request headers ↗. Commented Jul i have seen lots of answers but everyone mentions converting user agent into regex format. The next block is the operator. Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company The relevant . Follow edited Feb 6, 2017 at 23:36. 0 (compatible; ICS)" bad_user Deny from env=bad_user How to Block User Agents and Referrer Sites . – Zistoloen. Allow only one User-Agent, block the rest in nginx? 0. htaccess but it seems not to work: RewriteCond %{HTTP_USER_AGENT} ^-?$ RewriteRule ^ - [F] You can create an iRule to block requests containing certain elements. is any character), which clearly does not match the stated user-agent string. You may end up blocking legitimate website visitors using the same User-Agent. RewriteEngine On RewriteCond %{HTTP_USER_AGENT} ^BlackWidow [OR] RewriteCond Once you find the . Is it possible to ban certain user agents directly from web. use this. Hello, Is it possible for the Palo Alto to natively identify, detect, block and/or log the browser user-agent information if the application - 33537 This website uses Cookies. I read the solution to block null/empty user-agent request here but I was checking if we can block it by web. The real User Agent string is: Mozilla/5. So i think they have done some restriction to cURL. That’s why you don’t add values to the strings. X Cause None. Still visits the site I write down the HTTP_USER_AGENT value of Hi Xin, the datagroup we created should be like an array and not like a hashtable. How could I block him to avoid bandwidth loss? I already used the code below in . The syntax is as follows to block a single bot using a user-agent: user-agent: {BOT-NAME-HERE} disallow: / Here is how to allow specific bots to crawl your website using a user-agent: User-agent: {BOT-NAME-HERE} Allow: / Where to place your robots. What I've found is that the Android webview cannot handle the PDF content type, so it launches a PDF viewer through an intent. htacces rules below: RewriteEngine On RewriteCond %{HTTP_USER_AGENT} ^. * /my-iPhone-site/ [R] Which you could modify in your case to redirect users with Description Use ASM to block request with custom user agent Also have such requests is that in the ASM application event logs for visibility as well as determination of which requests are generating violations Environment ASM User-agents iRule Event logs Cause By default, ASM does not inspect user-agent and requires user-defined violations Recommended Actions On Apache servers it is very easy to block unwanted bots using the . Here's an explanation of the situation and steps to block the BAV2ROPC user agent: Understanding BAV2ROPC: BAV2ROPC stands for "Basic Authentication Version 2 Resource Owner Password Credential. Block User Agents in Nginx. - [R=403,L] The first line above enables mod_rewrite, while the next two lines check the exact user-agent value of each request and block the ones with user-agent values as spambot or spamcrawler. Here’s the basic syntax for blocking a specific user agent in your . htaccess file to block the identified robots. Simply add the following code to the file to block the engines. You can use the following key commands to build the iRule: The [HTTP::header "User-Agent"] command returns the user-agent string from the client-request header. axd Disallow: /cgi-bin/ Disallow: /member User-agent: bingbot User-agent: ia_archiver Disallow: / This disallows crawling of anything for "bingbot" and "ia_archiver". RewriteEngine On RewriteCond %{HTTP_USER_AGENT} !Lynx/2\. The (relevant) user agent rule (on chrome) is: input, input[type="password"], input[type="search"] { cursor: auto; } Blocking a site access by user-agent is a bad idea because you block all users with this user-agent (especially if the user-agent is well known like Mozilla). Imagine if the majority of the hits are coming through that unwelcomed user-agent or referrers and you think your site is getting good traffic, but in reality, they are useless. Published on The "problem" here is that there is actually no input style in the author stylesheet (see the spec for more info), and therefore the style that is defined in the user agent stylesheet is used. " It's a user agent commonly used by older email apps and devices that rely on basic authentication to access email accounts. 0. 1; WOW64; rv:13. Environment BIG-IP ASM 15. * - [F,L] To block the requests from machines with missing User Agent, add the following rules in your . Field = User Agent Operator = contains Value = Enter the user agent you need to block. The : after the name indicates that you want to investigate only the mentioned header, namely User-Agent. css; user-agent; microsoft-edge; Share. A brief search for user-agent through the Chrome Web Store reveals many such options. I downloaded the latest boilerplate a few days ago and designed on it. Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company Block empty user agent with URLScan. Those bots should not be able to see any page on my server and they should not appear neither in I found out it is there because of the user agent style sheet (Google Chrome) and there is set a margin of 8px to the body tag as default. By clicking Accept, you agree to the storing of cookies on your device to enhance your community and translation experience. location /file-to-block. I've added a http_user_agent deny, but it doesn't work at all. The top listed one, “^$” is the regex for an empty string. See this page for further information about Yahoo robots. If you just wanted to block one particular User-Agent string, you could use this RewriteRule: In AWStats in my Cpanel, I could see that I've a large bandwidth used by a bot called "empty user agent string" (see the pic attached). ModSecurity + optional LiteSpeed/Commodo ModSecurity rule set, but each UA you want to Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company As I know we can block bots with bots. conf: #us If the user-agent that you want to allow is: Lynx/2. Could you please suggest the best approach to care of this. The activity of crawling bots and spider bots of well-known search engines usually does no matter site load and does not affect a website's work speed. config? Certain robots seem not to follow robots. If you want to block all Android browsers with a User-Agent that contains the word ‘android’, you can use the following pattern: *Android* So we look for packets headed toward port 80 and have a "User Agent" string. Scott Scott. config. Use a Random User Agent in Playwright. htaccess file: Here’s the basic syntax for blocking a specific user agent in your . I used the below pattern for my rule. I'd use fail2ban but I haven't found a way to nicely apply that to http requests at this point. http_access deny rule_name see this for user agent names User Agents. SetEnvIfNoCase Referer "^$" bad_user SetEnvIfNoCase User-Agent "python" bad_user SetEnvIfNoCase User-Agent "catexplorador" bad_user SetEnvIfNoCase User-Agent "^$" bad_user Order Deny,Allow Deny from env=bad_bot To block more than one User Agent (e. Select Using: regular expressions. *(SCspider|Textbot|s2bot). Blocking that browser string (as opposed to the IP's, which are all over the place) seems like the best call. txt as it should. e. 1" ``` or other vers I have an example block specific user-agent such as spider. e. To configure user-agent block list, open the nginx configuration file of your website, where the server section is defined. Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company Aaarghhh When we had two conditions - user-agent is empty (lets say condition A) and source IP not from our list (condition B), we can say we should block request when A is true and B is true, or we can say that we should pass request when A is false or B is false. so far I have something like this: if ($http_user_agent = "Mozilla/5. You must use this to block Yahoo. 0. Use custom rules to block requests that don't contain a user agent header. 1; WOW64; rv:63. Click on “Create firewall rule”. *$ line sets a condition for the rewrite rule that follows. axd. *CRAWLER. While google has been given the greenpass to crawl anything on the site. 74. Many rogue bots use old and out of date browser user agents. 2 How to delimit browser agent selection for Sitecore device? 2 How can I block some special User-agents Via IPTables. SetEnvIfNoCase User-Agent "^yandex. htaccess’ to block specific User-Agents, enhancing your website’s security and performance. [Bb]ot\b/ or /Spider/ in their user-agent. Stack Exchange network consists of 183 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, Should not have additional performance impact (the user-agent inspected already as its displayed in your log), I didn't try OR command, but PCRE have it (maybe best to try in lab 1st). And if you want to But there are MANY user agent stylesheet rules, some with long names like margin-block-start. htaccess User-agent: * Disallow: / User-agent: google Allow: / This sample robots. *Baiduspider. Solution In FortiWeb restrict browsers by: - Creating FortiWeb custom rules and policies to detect browsers based on http header 'User-Agent'. htaccess file? What is a user-agent you might ask? Well, it is a string, which usually defines the browser and operating system of the device from which the request originated. Let’s say you’ve noticed a bunch of nasty spam requests all reporting one of the following user agents: EvilBotHere SpamSpewer SecretAgentAgent. Resolution As you are using the requests library "as is", the most probable reason for the block is a missing User Agent header. I have a cURL client (submitter) on own Server and listening script on other's Server, which one is not under my control. 3; Trident/7. I just want to allow ONE SPECIFIC user agent rather than trying to block all. d/blacklist-user-agents. ? Here's my nginx. py file. Simply uncomment the USER_AGENT value in the settings. To I'm trying to whitelist a very specific User Agent string in Nginx. You don't want to find The user agent string, also referred to as the UA or UAS, is a code snippet presented by a web browser such as Chrome or Firefox to a website’s server. What you need to consider here is that some bots (especially "larger" more prominent ones) will use several user-agents to access your site. To block the requests from machines with missing User Agent, add the following rules in your . It is typically included in the HTTP headers, and each browser or operating system has To block user agents, you can use . Finally, restart the Nginx web server to take the new configuration changes into effect. For example: RewriteCond %{HTTP_USER_AGENT} ^-?$ [OR] RewriteCond %{HTTP_USER_AGENT} Tachiyomi [NC] RewriteRule ^ - [F] So the above rule is successful when the User-Agent string is either empty or a single hyphen OR contains "Tachiyomi" (case-insensitive). This post shows you how to block Baidu Spider bot, using IIS URL Rewrite Module based on its User-Agent string. *) [NC] You are matching against a string in each iteration between the parenthesis separated by the pipe character | whereas . Improve this answer. 8. You need to check that the User-Agent header contains "YandexBot" (or How do I block a user-agent from Apache. Please give me code for User-Agent "Yandex" and "Baidu", Also we have lot of block blank User-Agent strings is this good or need block?If so how we can block? Please note, User-Agent- Majestic-12 and User-agent: Slurp — Slurp is the Yahoo User-agent name. Issue. How to whitelist a I really can't find a solution, can someone pleas tell me how to block the following specific user agent exactly via isapi rewrite 3. Example Directive. 0) Gecko/20100101 Firefox/A1E1" RewriteRule ^ - [F] This serves a 403 Forbidden for any request from that exact I've been getting so many requests from an agent identifying as "Mozilla/4. htaccess code I am using: Note: I should say here that it is better to check your access logs to see exactly what these user agents are and block them specifically. tsar kla aac ztohcsk ejdma cbdsx mqln bxelr hcqlanmul renemj