
Git Push Rejected Non Fast Forward: Troubleshooting Checklist
If you see ! [rejected] main -> main (non-fast-forward) when running

If you see ! [rejected] main -> main (non-fast-forward) when running

When you have two-factor authentication (2FA) enabled on your Git service (GitHub, GitLab, Bitbuc...

You start a Docker container, and it exits almost immediately with exit code 137. This usually me...

You try to merge two branches and get fatal: refusing to merge unrelated histories. ...

When running Nginx as a reverse proxy in Docker, a 502 Bad Gateway error with 'upstream' ...

You open Chrome and see a sync error code—something like “Sync is paused” or “Error signing in.” ...