Mektozo , Just another Contoso ! :)

I have faced a problem when integrating Lync with Exchange 2010 UM , where calls could not be established to UM for external users, whenever i call the susbscriber access from the Internet i get the following error: "call failed due to network issues. try logging out of lync logging back in, or try again later" After revewing the logs, i found the following entry in the event viewer on the Lync front-end server : Event ID: 1400 Source: MSExchange Unified Messaging The following UM IP gateways did not respond as expected to a SIP OPTIONS request. Transport = TLS, Address = lyncfe.domain.com, Port = 5061, Response Code = 0, Message = This operation has timed out. Solution: Issue a certificate dedicated to UM, where the subject name is the FQDN of the UM server.

I was adding amailbox server to a DAG, the mailbox server was in another site than the original DAG members, the wizard fails with the errror "A server-side database availability group administrative operation failed. Error: Windows Failover Clustering timed out while trying to validate server 'exchange03'. If this is in a disjoint DNS namespace, the DNS suffixes for all servers in the database availability group must be present on every server." as in the screen shot below: after googling a bit i found this very useful post ( http://www.exchangemaster.net/index.php?option=com_content&task=view&id=143&Itemid=1&lang=en ) thank you Dejan, you really saved my day. The issue was that there was an ISA server separating the two sites , the solution was to turn off the option called "Enforce Strict RPC Compliance" in ISA server. SOLUTION Turn off the Enforce Strict RPC compliance option in ISA Server. This option can be found in 2...