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Title
Calendar Agent failing with LDAP error:"9/5/2012 10:01:19 AM aeLdap:Log Error 80 Unknown error oc -
Description
CSA agents installed on the agent host in the target domain are not synchronizing calendars.
The following error repeated in the log for every mailbox:
"9/5/2012 10:01:16 AM CADQueue::NextItem Informational 4511 Starting to process item '/o=Domain/ou=First Administrative Group/cn=Recipients/cn=amano' (Collection 'Exec', PST: '009BA1E2BC36954FB22545152F229AA38', SyncMailboxInfo: 'True', SyncSwitched: 'False', SyncAllContent: 'False', SyncFolderContent: 'False').
9/5/2012 10:01:19 AM aeLdap:Log Error 80 Unknown error occurred (LDAP_OTHER). Cannot establish a session with an LDAP server (HostName 'SOURCEDC', ldap_open).
9/5/2012 10:01:19 AM EMWLDAP40::LDAPSearcher::Retrieve Error 5105 Cannot open LDAP on 'SOURCEDC', port '389'
9/5/2012 10:01:19 AM EMWLDAP40::LDAPOperations::GetRootDSEInfo Error 5111 Error occured during retrieve info from RootDSE (RootDSE).
9/5/2012 10:01:19 AM CMBMConn::Session Error -2147215278 Cannot create MAPI Session object."
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Cause
Calendar agents require access to both source and target Exchange servers and domain controllers.
The ping from agent host to 'SOURCEDC' failed.
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Resolution
Resolve name resolution on the agent host. Adding 'SOURCEDC' to the hosts file resolved the issue.