The internal health monitoring system may report Unhealthy, and an error similar to the following is reported by SCOM:

Alert: {2} Resolution state: New
Alert: {2}
Source: EXCH02 - Compliance
Path: EXCH02.contoso.com;EXCH02.contoso.com
Last modified by: System
Last modified time: 9/3/2015 11:43:37 AM Alert description: EMSMDB.DoRpc(Logon) step of ComplianceOutlookLogonToArchiveRpcCtpProbe/EXCHDB03 has failed against EXCH02.contoso.com proxying to Unknown for HealthMailbox8414258ad6574db1ad62eb67e94b9d6d@contoso.com.
Latency: 00:00:00.9250000
ActivityContext:
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Details:
Error: Error returned in LogonCallResult. Error code = WrongServer (0x00000478)
Log: RpcProxy connectivity verification  ...