No space left on device: Couldn’t create the rewrite-map mutex: Configuration Failed [Apache]

Ramya Santhosh — Mon, 04 Sep 2023 11:51:01 +0000

Since my webserver (apache) wasn’t responding, I restarted the apache service. Most of the time restarting works, this time it didn’t! The error message was “No space left on device: Couldn’t create the rewrite-map mutex: Configuration Failed”. Let’s try to diagnose the issue and find the solution. Analyse why Apache restart...

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Configure Apache for WebSockets using Reverse Proxy

Ramya Santhosh — Tue, 29 Mar 2022 05:28:50 +0000

I used WebSockify in my web application to connect to the VNC server using noVNC to enable remote access to Linux servers via the browser. It was an easy implementation as there was no firewall involved and the WebSocket port was opened. However, recently I had to migrate to another...

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SELinux: Cannot write into “Config” directory! [OwnCloud]

Ramya Santhosh — Tue, 15 Mar 2022 06:13:29 +0000

I installed owncloud with all the necessary pre-requisites and when tried to access over the browser encountered error: Cannot write into "Config" directory! Below is the complete error list. How to fix Cannot write into “Config” directory! [OwnCloud] The error above clearly conveys that, the webserver is unable to write...

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How to stop Apache mod_rewrite log message [Apache]

Ramya Santhosh — Fri, 03 Dec 2021 08:48:45 +0000

I had written a few rewrite rules to disable HTTP TRACE and TRACK as part of VAPT. When looking at the httpd logs, a dozen of [rewrite:trace3] warning messages are logged per request and the actual error messages were lost. Below are the warning message snippets. This article will show...

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How to Enable HSTS (HTTP Strict Transport Security) Policy in Nginx & Apache

Ramya Santhosh — Fri, 26 Nov 2021 07:26:39 +0000

According to Netcraft’s study, 95% of HTTPS servers are vulnerable to Man-in-the-Middle attacks. Therefore, it is very important to implement HSTS properly. HSTS (HTTP Strict Transport Security) is a policy that protects websites against malicious attacks such as clickjacking, protocol downgrades, and man-in-the-middle attacks as explained in my earlier article....

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How to disable HTTP TRACE/TRACK methods in APACHE

Ramya Santhosh — Fri, 26 Nov 2021 07:11:05 +0000

VAPT testing by the security experts group suggested disabling HTTP TRACE/TRACK methods. TRACE and TRACK are HTTP methods that are used to debug web server connections. An attacker can create a webpage using XMLHTTP, ActiveX, or XMLDOM to make a client issue a TRACE request and capture the client’s cookies....

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Hide Apache and PHP versions from HTTP Headers

Ramya Santhosh — Thu, 25 Nov 2021 07:39:23 +0000

Website security is the most important and critical component of web hosting and revealing Apache and PHP versions on the HTTP header helps hackers to attack your web server using version-specific security breaches. Earlier I had written an article on How to hide Nginx and PHP versions in the HTTP...

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Failed to open stream: Permission denied [Apache]

Ramya Santhosh — Wed, 24 Nov 2021 10:05:33 +0000

Moved my local development files to the server after setting up Apache, PHP, and MySQL on my CentOS 7. When I tried to access one of the pages, noticed a “Failed to open stream: Permission denied” warning message in the error_log file. Below is the complete warning message: [Wed Nov...

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RewriteCond: NoCase option for non-regex pattern ‘-f’ is not supported [htaccess]

Ramya Santhosh — Wed, 17 Nov 2021 11:38:55 +0000

After removing the .php extension from the URLs, I ended up seeing a warning “RewriteCond: NoCase option for non-regex pattern ‘-f’ is not supported and will be ignored” in the Apache error log. Below is the complete error message. [Wed Nov 17 09:34:36.521614 2021] [rewrite:warn] [pid 9311] AH00665: RewriteCond: NoCase...

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[CentOS 7 Apache]: Permission denied: file permissions deny server access

Ramya Santhosh — Fri, 12 Nov 2021 07:08:47 +0000

Whenever I configure Apache on CentOS 7, most of the time I get “(13) Permission denied: file permissions deny server access” error as below: [Fri Nov 12 06:29:24.901157 2021] [core:error] [pid 8287] (13)Permission denied: [client 192.168.10.12:15979] AH00132: file permissions deny server access: /var/www/html/admin/images/logo.png How to fix file permissions deny server...

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