Checklists for software errors, setup, and tool workflows.

How to Fix Microsoft Teams 504 Configuration Error

You try to sign in to Microsoft Teams and see a 504 configuration error. The app may hang or show...

Fix Putty Connection Refused Due to Windows Firewall

You're trying to SSH into a remote server using Putty, but you get a 'Connection refused' error. ...

Fix Windows Activation Login Loop Stuck on Loading

You try to activate Windows, enter your credentials, and the screen hangs on a spinning circle or...

Nginx 502 Bad Gateway: A Practical Troubleshooting Guide

Seeing a 502 Bad Gateway from Nginx usually means the upstream server (like PHP-FPM, uWSGI, or a ...

Fix Go Modules Proxy 'No Such Host' Error

When using Go modules with a proxy, you may see an error like:

go: example.com/modu...