System Administration

Latest news, tutorials, and updates from ARPHost

October 5, 2026 Dejan Protich

A domain controller offline longer than MaxOfflineTimeInDays leaves DFSR SYSVOL in State 5 while AD replication looks healthy. Here is…

May 27, 2026 ARPHost

You're usually not searching how to create a file on Linux because you're writing a note to yourself. You're doing…

April 23, 2026 ARPHost

The default FTP port for the control connection is TCP port 21, and the default data port is TCP port…

March 19, 2026 ARPHost

Working from the command line is the key to managing a server efficiently, and knowing how to create a folder…

March 18, 2026 ARPHost

Ever wonder how servers manage to run backups at 2 AM or clear out old files without anyone lifting a…

March 17, 2026 ARPHost

A kernel panic is a critical system error where the operating system's core, the kernel, hits a problem so severe…

March 16, 2026 ARPHost

Swap memory is a reserved area on your storage drive that the operating system uses when physical RAM is full.…

March 12, 2026 ARPHost

Before you write a single line of code or install any packages, the most critical decision you'll make is where…

March 4, 2026 ARPHost

So, you need to open a port on your Ubuntu server. The quick answer is the sudo ufw allow <port>/<protocol>…

March 3, 2026 ARPHost

In a modern threat environment, deploying a server with its default settings is akin to leaving the front door of…