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 Cloudflare Origin Certificate Not Trusted by Browser
You've set up Cloudflare with an origin certificate, but browsers show a warning that the cer...
Cloudflare DNS Propagation Not Working with New Domain: Fixes
You registered a new domain, set it up with Cloudflare, but after hours (or days) the site still ...
How to Update Git Remote Origin URL
When a repository's remote URL changes—for example, after migrating to a new Git server or sw...
Fix VS Code Terminal Not Working After Update
After a VS Code update, the integrated terminal may fail to start, show a blank window, or displa...
Fix Git Permission Denied in VS Code Terminal
You're working in VS Code, try to run a Git command in the integrated terminal, and get a ...
Issue queue
SitemapResolve Remote Desktop Certificate Trust Issues
Fix Chrome Certificate Error: Invalid Authority on Company Network
Android Chrome ERR_NAME_NOT_RESOLVED Troubleshooting
Fix fatal: refusing to merge unrelated histories error
Free Up RAM by Disabling Chrome Extensions
Chrome Safe Mode Certificate Error Fix Guide
How to Resolve Cloudflare SSL Mismatch
Windows 11 Permission Error 0x80070005 Fix
Fix Git LFS Push Errors: Common Causes and Solutions
How to Fix Chrome Extensions That Won't Load
Python Requests Timeout Not Working: How to Fix
Fixing Python Memory Errors When Reading Large Files Line by Line
Fix Chrome Certificate Error: Invalid Authority on Company Network
Android Chrome ERR_NAME_NOT_RESOLVED Troubleshooting
Fix fatal: refusing to merge unrelated histories error
Free Up RAM by Disabling Chrome Extensions
Chrome Safe Mode Certificate Error Fix Guide
How to Resolve Cloudflare SSL Mismatch
Windows 11 Permission Error 0x80070005 Fix
Fix Git LFS Push Errors: Common Causes and Solutions
How to Fix Chrome Extensions That Won't Load
Python Requests Timeout Not Working: How to Fix
Fixing Python Memory Errors When Reading Large Files Line by Line