How to Fix Nginx 'Upstream Connection Refused' Error
When Nginx returns a 502 Bad Gateway with upstream connection refused in the error l...
Software troubleshooting desk
Practical fixes for tool errors, setup blocks, and workflow issues.
Symptom
Cause
Fix route
Verify
Fresh repair notes
All notesFix Git SSL Certificate Problem: Unable to Get Local Issuer Certificate
When you run git clone, git pull, or git fetch over HTTPS,...
Fix 'fatal: refusing to merge unrelated histories' in Bitbucket
You're working with a Bitbucket repository and when you try to merge two branches, Git throws...
Cloudflare SSL Full Strict Not Working After Update: Fixes
After a Cloudflare update or configuration change, you might see SSL errors like ERR_SSL_PR...
Fix Docker Container 'No Space Left on Device' Error
You try to write a file inside a running Docker container and get no space left on device
How to Create a Docker Network If Not Found
When you run a Docker container and get an error like network not found, it means th...
Issue queue
SitemapResolve index.lock Exists in Git on Linux
Git Push Rejected: Unrelated Histories Fix
Windows 11 No Internet on WiFi – Other Devices Work
Git Merge Conflict Resolution Guide
Resolve Cloudflare SSL Full Strict Mode Failure
Nginx Config Test Fails in Docker Container
DNS Probe Finished NXDOMAIN with Custom DNS – How to Fix
Cloudflare Error 521: Web Server Down Checklist
Cloudflare 522 Error: Server Timeout Fixes
npm Build Failed: Syntax Error Troubleshooting
Chrome Extensions Grayed Out: Fixes That Work
ERR_CERT_AUTHORITY_INVALID Localhost Fix
Git Push Rejected: Unrelated Histories Fix
Windows 11 No Internet on WiFi – Other Devices Work
Git Merge Conflict Resolution Guide
Resolve Cloudflare SSL Full Strict Mode Failure
Nginx Config Test Fails in Docker Container
DNS Probe Finished NXDOMAIN with Custom DNS – How to Fix
Cloudflare Error 521: Web Server Down Checklist
Cloudflare 522 Error: Server Timeout Fixes
npm Build Failed: Syntax Error Troubleshooting
Chrome Extensions Grayed Out: Fixes That Work
ERR_CERT_AUTHORITY_INVALID Localhost Fix