10/29/2026
PostgreSQL WAL Size Increasing? How to Fix It
Is pg_wal filling your disk? Fix postgresql wal size increasing by finding inactive replication slots or failing archiving, then clean up WAL disk usage safely.
By Muhammad Wilayat Shah
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#linux troubleshooting
Published posts with this tag.
10/27/2026
How to Troubleshoot Network Latency and High Ping
Learn how to troubleshoot network latency step by step: baseline with ping, find the hop causing packet loss with mtr, fix Wi-Fi and bufferbloat, and rule out DNS and server delays with curl and ss.
By Muhammad Wilayat Shah
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10/26/2026
How to Find Which Process Is Using a Port
Getting EADDRINUSE or address already in use? Learn how to find process using port numbers on Linux, macOS, Windows and Docker with ss, lsof, fuser and netstat, then stop it safely or move your app to a free port.
By Muhammad Wilayat Shah
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10/26/2026
SSH Connection Refused: How to Fix It on Ubuntu
Getting ssh: connect to host port 22: Connection refused? Learn why SSH port 22 is refused on Ubuntu and fix it step by step: install and start sshd, check the listening port, validate sshd_config, and fix UFW, fail2ban and Docker port issues.
By Muhammad Wilayat Shah
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10/26/2026
Linux DNS Troubleshooting: Fix DNS Resolution Failures
Fix DNS lookup failed errors on Linux step by step: test with getent and dig, check resolv.conf and systemd-resolved, set nameservers in Netplan or NetworkManager, open port 53, and fix DNS inside Docker containers.
By Muhammad Wilayat Shah
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