#networking

Posts on X2Q tagged networking. Updated as new posts are published.

• Jun 10, 2026

  Factory reset a Yealink phone — even without the admin password (2026)

  You picked up a used Yealink desk phone, or inherited one with an unknown admin password. Here's how to factory reset it three ways — from the keypad, from the web UI, and (the important one) with a hardware key-hold that doesn't need the admin password at all. Plus what changed about Yealink's default password: 'admin/admin' on older firmware, a unique per-device password on newer units.

• Jun 5, 2026

  Find which process is using a port on Linux (ss, lsof, fuser) — 2026

  When a server won't start because the port is taken, you need the PID holding it. ss is the modern one-liner; lsof and fuser are the alternatives. Here's how to find the process and free the port.