OneDrive Sync Proxy Error: Troubleshooting Checklist
If you see 'Proxy error' or 'Cannot sync' in OneDrive while connected through a corporate or home...
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You try to send or receive email in Outlook and see an error: "Proxy authentication failed"
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You open Windows Security or try to run a scan, and instead of working, you get a 504 timeout err...
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When Windows Security throws a 502 Bad Gateway error, it usually means the app can't reach its ba...