My phone (a Samsung Ativ-S) is configured with an Office 365 email account for work, but this doesn't connect when I'm at home.
To be clear:
When I connect via cellular data, email sync works fine.
When I connect via wireless at work, it also works fine.
When I connect via wireless at home, it fails with error code 80072EFD.
Suggestions I found after many hours using Google and Bing and tried in order to isolate the problem:
Restart the phone: no change, still fails.
Toggle Airplane mode: still fails.
Wifi at a friends house: works fine.
Use Fiddler on my laptop as a proxy on my home Wifi: works fine.
Reconfigure my wireless router to use Google DNS: no change, still fails.
Reconfigure router to use OpenDNS: no change, still fails.
Disable IP6 on the router: no change, still fails.
I don't have mobile coverage at home, so I can't just disconnect from the Wifi, I need it to work.
It seems pretty clear that the phone itself is correctly configured (because it works on cellular and on other Wifi networks), so I'm sure the problem must be with my home Wifi network.
What causes this error and how do I get email Sync to work at home?