SCA (Statistics Collection Agent) encounters problems while connecting to the clustered Exchange server and then session is finished - no other Exchange servers are processed:
6/16/2009 11:42:54 PM GatherStatistics Informational 600 Collecting statistics information from server 'CLUSTER1'.
(null) (null) Error 1722 The RPC server is unavailable.
6/16/2009 11:42:54 PM CAffectedServer::CCluster::GetActiveNodeName Error 2802 Cannot open cluster 'CLUSTER1'.
6/16/2009 11:42:54 PM GatherStatistics Informational 602 Completed collecting statistics from server 'CLUSTER1'.
6/16/2009 11:42:54 PM SCA::Application::StopSession Informational 512 Session finished at 6/16/2009 11:42:54 PM on server 'CLUSTER1'.
1. Please grant sufficient permissions for the SCA account to connect to Exchange server. In case of cluster it needs to be able to connect to each node. Add account to Local Administrators on all Exchange servers (cluster nodes) where Quest Mail Source and Mail Target agents are running.
2. Exclude such server from statistics collection.