Have a new Exchange 2013 server setup as a Hybrid with Office 365. On some computers OWA logs in fine and on others it logs in and then logs out instantly then when you try to log back in you get the error that something went wrong and OWA stops working for that user until I iisreset or restart the OWA Application pool in IIS and then it works again.
Example:
On PC1 I log into owa as User1 and it works fine. Go to PC 2 and OWA logs in and then logs out instantly then go to log back in from PC1 or PC2 and get the error something went wrong. All other users continue to work fine from PC1, but PC2 causes the issue for every user that logs into it and to fix it I have to cycle IIS or the apppool for OWA.
Problem occurs on PC, The Exchange Server itself when checking OWA, and MACs I have tried.
Error in application event log states. "Mapi session /o........ with client type OWA exceeded the maximum of 16 objects of type session.
Running of Exchange 2013 CU2 V2.
I've been banging my head against a wall on this. Thanks in advance for any help.