Jan Reilink 
Windows Server
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Windows Server IIS loves to tell the world that a website runs on IIS. It does so with the “Server:” header in the HTTP response, as shown below. In this post I’ll show you how to remove HTTP response headers in Windows Server IIS. You don’t want to give hackers too much information about your servers, right?.
Windows Server
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When the .svc web service handler doesn’t work in IIS with ASP.NET 4.5 and returns a 404 Not Found error, you may need to add an extra handler to IIS. Read on…
Web applications
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Learn how to speed-up Joomla performance on Windows Server IIS using these 8 simple, but important, tips. Add caching, gzip compression, set your sessions & optimize MySQL database functions.
GNU/Linux
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MySQL indexes (indices) are important. Why? Because they speed up the process for MySQL to find requested information.
GNU/Linux
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Converting MyISAM tables to InnoDB for more database performance, because: 1) MyISAM is old and no longer developed, and 2) InnoDB is much faster.
GNU/Linux
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How to delete all MAILER-DAEMON emails from your Postfix queue, when it matches a sender or recipient email address condition. In Postfix, there are various similar commands to delete messages from the Postfix mail queue, based on the Message-ID and/or email address for example…
Windows Server
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Easily enable support for the WebSocket protocol on Windows Server IIS by installing the Web-WebSockets feature using PowerShell. Learn how to install WebSocket Protocol support in Windows Server IIS 8.0.
Windows Server
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Sometimes it’s important to remove (or hide) the file extension of scripts you use. Security by obscurity might be that reason, if you don’t want others to know what script language you are using for your website, or for static site hosts.
Codebase
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Investigate SMTP authentication issues like a boss! When using TLS encrypted SMTP connections, it’s always handy if you are able to create a SMTP logon credentials and test SMTP authentication over a TLS/StartTLS connection. Preferably from your command-prompt.
Windows Server
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Gzip compression conflicts with IIS Outbound Rules resulting in HTTP 500.52 URL Rewrite Module Error. Here is how to resolve this.
WordPress
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The autoload feature loads and caches all autoloaded options, if available, or all options. The default option is to autoload, and over time when the wp_options table grows, this degrades performance. Today I noticed a slow MySQL query coming from a WordPress database (WordPress wp_options table). This made me investigate and to optimize the WordPress wp_options table “autoload” feature.
Useful
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MySQL’s mysqlcheck is a command line table maintenance program: it checks, repairs, optimizes, or analyzes tables. Very handy for automated performance optimizations of MySQL databases and tables.
Windows Server
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On IIS, Contact Form 7 captcha has one HUGE disadvantage: temporary captcha files placed in wp-content/uploads/wpcf7_captcha, are not automatically removed. Here is how to remove Contact Form 7 temporary captcha files on IIS…
Codebase
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Change file attributes with PHP chmod to make files read-only or normally accessible on Windows Server IIS.
Codebase
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The System.Net.Mail Namespace leaves out the required Message-ID header in email. Here is how you can add this important header to your email, to make sure email arrives.
Web applications
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PHP script to make your MySQL database smaller, leaner and faster by optimizing all tables with mysqli multi_query().
WordPress
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Delete WordPress spam comments and meta data in your database, easily with phpMyAdmin or mysql cli. Keep your WordPress database lean & mean!
Umbraco
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Configure Umbraco for SQLServer sessionState storage and prepare Umbraco for high performance web garden or web farm, and load balancing environments. This post explains it all.
Codebase
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Check the connectivity of multiple MySQL servers, and connect to the servers in a loop. Here are two example code snippets
Windows Server
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Address both x86 and x64 versions of .NET with AppCmd. When administering an IIS web server you frequently have to use AppCmd.exe to make configuration changes. Whether it is for a specific web site or server wide. Some think AppCmd is very limited, but here is how you can target multiple ASP.NET versions with AppCmd!