How to Fix Nginx 'Upstream Connection Refused' Error - How to Fix Git 'index.lock' File Exists Error-Setting Node.js --max-old-space-size for Memory Errors
Before changing system settings, save your work and note the exact error text so you can compare results after each step.
Extra verification checklist
- Restart the affected app after changing permissions or configuration files.
- Test the same workflow in a clean browser profile or a temporary user account.
- Compare the result on another network if the error may be connection related.