Linux
How to Install and Configure OpenSSH Server on Ubuntu
Jason Yang · 05 Dec, 2025
Install and configure OpenSSH Server on Ubuntu: the install steps, UFW firewall setup, and connection testing for Ubuntu 22.04, 24.04, and newer.
Blog posts — page 17
Linux
How to Find and Kill Processes Occupying a Port (lsof, netstat, ss)
Jason Yang · 04 Dec, 2025
Fix "Address already in use" errors on Ubuntu/Linux. Quickly identify port-hogging processes with ss, lsof, or netstat and terminate them safely.
Cloud & DevOps
Understanding TCP: Architecture, Segment Structure, and Handshakes
Jason Yang · 04 Dec, 2025
TCP explained: how the segment header, the 3-way handshake, and flow control build a reliable connection over an unreliable network.
Linux
How to Disable Wi-Fi Power Saving on Ubuntu to Prevent SSH Lag
Jason Yang · 04 Dec, 2025
SSH lag on Ubuntu? Your Wi-Fi card may be entering sleep mode. Disable Wi-Fi power management to keep the connection responsive — quick step-by-step.
Linux
How to Set a Static WiFi IP on Ubuntu (Without Router Access)
Jason Yang · 03 Dec, 2025
Need a static WiFi IP on Ubuntu without router access? Learn how to use nmcli for laptops (GUI-safe) or Netplan for servers to set a fixed IP.