Technology

A practical look at why the MIT krb5 KDC rejects a TGS-REQ with KRB_AP_ERR_NOT_US, including the exact validation logic and the most common root causes behind the error.

Mod_rewrite is a rule-based rewriting engine (based on a regular-expression parser) to rewrite requested URLs on the fly.

Have you ever replaced a network interface (NIC) or performed a chassis swap? If you are an administrator or IT professional the chances are good that at some point or another you have had to deal with sticky udev rules.

Postfix is a free and open-source mail transfer agent (MTA) that routes and delivers electronic mail. This post covers core system concepts.

A quick Postfix Command Reference

There are a variety of Hypervisors out in the in the hosting space. Here is a list of the current classifications.