We are running Exchange 2010 SP3 RU 11. 2 CAS/HT server 2 Mailbox servers with DAG. No CAS Array, No NLB.
On the secondary server: Able to login to owa, but unable to perform any tasks within owa. Receive message: 'An unexpected error occurred and your request couldn't be handled'.
Error in event log on primary mailbox server: Event ID 4002 MS ExchangeAvailability; Process 2068.
Note: I can provide the rest of the even log info when requested.