Fix 'Git Remote Origin Already Exists' When Updating Remote URL - Resolve 522 Error with DNS-Only Mode in Cloudflare-Troubleshooting Nginx Upstream Connection Refused Port 80

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.