Hi all,

Until yesterday, I had fully functional Exchange server. Overnight some bundle of updates came and server had restart, in the morning ActiveSync for mobile deviced stopped working. After restart of Ex server, there suddenly appeared a lot of associated problems - OWA and ECP on both external and internal domains stopped working - diplaying notorious "Sorry! Access Denied" and a  lot of critical erros in Event Viewer. 

Sorting all these isues, I managed to make everything working, except ActiveSync.

ExRCA  throwing this HTTP OPTIONS realted errors with following message.

Attempting to send the OPTIONS command to the server.   Testing of the OPTIONS command failed. For more information, see Additional Details.   Additional Details   An HTTP 500 response was returned from Unknown. HTTP Response Headers: request-id: 5dbb5e4d-e7fd-442d-abd9-370204c0af20 X-TargetBEServer: server.contoso.local X-DiagInfo: SERVER X-FEServer: SERVER Content-Length: 8441 Cache-Control: private Content-Type: text/html; charset=utf-8 Date: Thu, 16 Apr 2015 19:54:17 GMT Set-Cookie: X-BackEndCookie=S-1-5-21-2895690208-1618913748-335857996-1239=u56Lnp2ejJqBzs7JyczMz8zSnc/KzdLLysfO0sfGnZvSnJ7LzcyanZzGmczJgYHOydDPy9DNz87K383Pxc/Lxc7H; expires=Thu, 16-Apr-2015 20:04:18 GMT; path=/Microsoft-Server-ActiveSync; secure; HttpOnly Server: Microsoft-IIS/7.5 X-AspNet-Version: 4.0.30319 X-Powered-By: ASP.NET Elapsed Time: 296 ms

Same time, ActiveSync Autodiscover test passes.

Everything works fine, OWA, etc, but not a single mobile device with allowed ActiveSync can connect to server.

Would appreciate any ideas helping to solve that, thanks!

• Edited by Vitek B Thursday, April 16, 2015 8:04 PM