IT

Sometimes `apt-get update` fails with a NO_PUBKEY error when the repository public key is missing. Example:

Google documentation shows methods, but does not explain how to prepare data. First, we need DATA... From accounting team, Google Forms, or a simple Google Sheet with 3 columns.

Many mail clients show wrong email receiving date-time because the file creation time is wrong after migration or restore. Here is a short review on how to fix it for Dovecot on ISPConfig.

Sometimes you need old-school setups… Here is how to use PDO sqlsrv for PHP 7.3 on CentOS 7.

Preparing for migration from an old email system (±15 years old FreeBSD...) to the latest ISPConfig. One of the steps is creating email users. ISPConfig has minimalist documentation and few examples.

Next step using Open vSwitch (OVS) network configuration ( How to forward all VLANs to a KVM virtual machine using Open vSwitch (OVS) ) to provide only one VLAN.

By default, documentation suggests sending all traffic via OVS. This is risky, because OVS is an independent service that can stop, restart, or fail. My approach separates management and production networks for reliability.