Fix Nginx Upstream Connection Refused in Proxy Pass
When Nginx returns a 502 Bad Gateway or logs upstream connection refused
Software troubleshooting desk
Practical fixes for tool errors, setup blocks, and workflow issues.
Symptom
Cause
Fix route
Verify
Fresh repair notes
All notesFix Windows Security App Configuration Error
When you open Windows Security and see a message like "Your IT administrator has limited acce...
Git Detached HEAD vs Attached HEAD: What It Means and How to Fix
If you've seen the message "You are in 'detached HEAD' state" while using Git...
How to Resolve Git Merge Conflicts on the Same Line
You run git merge and get a conflict marker on a single line. The file shows both ve...
ERR_NAME_NOT_RESOLVED on Chrome for Mac: How to Fix
If you see ERR_NAME_NOT_RESOLVED in Chrome on your Mac, the browser can't transl...
Fix DNS Probe Finished NXDOMAIN Error on Mac
You're browsing on your Mac and suddenly a site won't load, showing the error DNS...
Issue queue
SitemapHow to Resolve 'git remote origin already exists' on GitLab
How to Fix Firefox Secure Connection Failed Error
How to Launch Windows Security in Safe Mode
VS Code Git Auth Failed on Linux – Fix
Resolving Python Dependency Conflicts in setup.py
Fix Python Dependency Conflicts After an Update
How to Fix Windows 11 Upgrade Stuck at 99%
How to Fix Windows Security App Crashing or Not Starting
How to Fix 'index.lock file exists' in Git Rebase
Docker Breaks VS Code Terminal: Troubleshooting
How to Resolve VSCode Save Permission Denied
Cloudflare DNS Not Propagating After SSL Certificate Change
How to Fix Firefox Secure Connection Failed Error
How to Launch Windows Security in Safe Mode
VS Code Git Auth Failed on Linux – Fix
Resolving Python Dependency Conflicts in setup.py
Fix Python Dependency Conflicts After an Update
How to Fix Windows 11 Upgrade Stuck at 99%
How to Fix Windows Security App Crashing or Not Starting
How to Fix 'index.lock file exists' in Git Rebase
Docker Breaks VS Code Terminal: Troubleshooting
How to Resolve VSCode Save Permission Denied
Cloudflare DNS Not Propagating After SSL Certificate Change