Git Push Rejected Non Fast Forward: Troubleshooting Checklist
If you see ! [rejected] main -> main (non-fast-forward) when running
Software troubleshooting desk
Practical fixes for tool errors, setup blocks, and workflow issues.
Symptom
Cause
Fix route
Verify
Fresh repair notes
All notesFix 'fatal: refusing to merge unrelated histories' in Git
You cloned a repository, made some commits locally, and now when you try to git pull...
Fix VS Code Terminal Not Opening with Node
You open VS Code, try to start the integrated terminal, and it either doesn't appear, flashes...
How to Generate a Cloudflare Origin Certificate
If you're using Cloudflare as a reverse proxy, you may want to encrypt traffic between your s...
Nginx Upstream Connection Refused: Diagnosis and Fixes
When Nginx returns a 502 Bad Gateway or logs "upstream connection refused", it means Ngin...
Fix 'git remote origin already exists' Error on Mac
If you see fatal: remote origin already exists when trying to add a remote repositor...
Issue queue
SitemapResolve Cloudflare Origin Certificate Error
Windows Update Service Disabled? Registry Fix Steps
Fix Git 'fatal: refusing to merge unrelated histories' on GitHub
Troubleshoot Group Policy Blocking Remote Desktop
Fix Python Dependency Conflict Error Code 1
Troubleshoot Docker Engine Startup Failure Windows
How to Fix Nginx Redirect Loop That Prevents Site Loading
Resolve pip Externally Managed Environment Error
Troubleshoot Firefox Secure Connection Warnings
Fix Python Requests ConnectTimeout
Fix 'Permission Denied' When Running pip install --user
Fix Nginx 502 Bad Gateway: Upstream Connection Refused
Windows Update Service Disabled? Registry Fix Steps
Fix Git 'fatal: refusing to merge unrelated histories' on GitHub
Troubleshoot Group Policy Blocking Remote Desktop
Fix Python Dependency Conflict Error Code 1
Troubleshoot Docker Engine Startup Failure Windows
How to Fix Nginx Redirect Loop That Prevents Site Loading
Resolve pip Externally Managed Environment Error
Troubleshoot Firefox Secure Connection Warnings
Fix Python Requests ConnectTimeout
Fix 'Permission Denied' When Running pip install --user
Fix Nginx 502 Bad Gateway: Upstream Connection Refused