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If you’re migrating a domain, sometimes their mail will go to the old server for a while after you’ve changed the DNS.

Add this to the Apache configuration:

Need a username and password from the Plesk DB?

MySQL’s default configuration sets the maximum simultaneous connections to 100.

If you’re looking to get PCI/CISP compliance, or you just like better security, disable SSL version 2.

Okay, so you’ve verified that the correct admin password is being used, but you still can’t login?

First, check max_upload_size in php.

If you have a ton of files in a directory and you need to remove them, but rm says that the “argument list [is] too long”, just use find and xargs:

If you need to remove subdomains from the URL that users enter to visit your website, toss this into your VirtualHost directive:

If you’re not a fan of scientific notation, use this to calculate the apache bandwidth used from log files in MB:

There are three main things to remember when it comes to the qmail queue:

If you work on enough servers, you discover that a lot of people put the security of their MySQL server on the back burner.

As most folks know, by default, MySQL limits the size of a MyISAM table at 4GB.

Sticky bits help you take file permissions to the next level.

If you find yourself in the sticky situation where kill -9 still won’t kill a sendmail process, check the process list.

Add this to the virtual host configuration if PHPLive says it has no session.

Remember, if you raise MaxClients for an MPM in Apache, you must raise the ServerLimit directive, which is normally set to 256 on most servers.

If you think you have a rooted RHEL box, you’ll want to run the usual rkhunter, chkrootkit, and you will want to inspect for rogue processes.

So you have multiple users that need to read and write to certain files on the filesystem?

If your server is spewing an invalid HELO, you could be blacklisted pretty quickly.

Setting up Postfix to handle mail for a virtual domain and forward it to external mailboxes is pretty easy.