The following Messages repeting in the Collaboration Services Events.
![2012/08/02 19:01:08.802] (2) Warning :<Exchange Layer> (32623) Connection to the Exchange server has been lost.(Network error or the Exchange server is down.)
![2012/08/02 19:11:25.893] (2) Information :<Exchange Layer> (32624) Connection to Exchange server has been restored.
![2012/08/02 19:28:26.491] (2) Warning :<Exchange Layer> (32623) Connection to the Exchange server has been lost.(Network error or the Exchange server is down.)
![2012/08/02 19:39:07.397] (2) Information :<Exchange Layer> (32624) Connection to Exchange server has been restored.
Also Syncing large publications will not complete.
When looking at a packet capture taken during a Connection Lost event you will see "Local limit exceeded" messages sent from Exchange Server defined as the connection server.
Example from Packet Capture where 192.168.0.7 is the QCS server and 192.168.0.1 is the Exchange Server QCS is configured to connect to:
192.168.0.7 192.168.0.1 DCERPC Bind: call_id: 2 Fragment: Single, 2 context items, 1st NSPI V56.0
192.168.0.1 192.168.0.7 DCERPC Bind_ack: call_id: 2 Fragment: Single Unknown result (3), reason: Local limit exceeded
192.168.0.1 192.168.0.7 DCERPC Fault: call_id: 2 Fragment: Single ctx_id: 0 status: nca_s_fault_access_denied
192.168.0.1 192.168.0.7 TCP 59533 > 55331 [FIN, ACK] Seq=117 Ack=201 Win=131072 Len=0 2012-08-09 15:15:48.131472
Or (192.168.86.185 being QCS, 192.168.80.31 being Exchange server QCS configured to connect to):
Or when testing the service account mailbox you may get the following errors Error "0X80040111" or "0X80040115"
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