Microsoft Exchange Server no longer updates via WiFi after upgrading to Lollipop I had my Samsung Galaxy Note 4 (as well as several other Samsung devices - such as two tablets) set up to sync with my Microsoft Exchange Server all without problems before upgrading to Android Lollipop. After upgrading to Lollipop, I am no longer able to sync (refresh) via wifi.

How to fix it?
You have to erase the proxy number in the APN network. This is something that Lollipop retrieves from your Data provider, but trunks the communication with the server.