Hi there.

I have been getting alerts for this IMAP service advising it is unhealthy and I hope you can help.  running the get server health gives an error "WARNING: No mailboxes were found to use in the CTP probe."  can anyone advise on this as im not sure how to resolve.  we have only 1 mailbox needing to use IMAP.

[PS] C:\Windows\system32>Get-ServerHealth -Identity exchange2 -HealthSet IMAP

Server          State           Name                 TargetResource       HealthSetName   AlertValue ServerComp
                                                                                                     onent
------          -----           ----                 --------------       -------------   ---------- ----------
exchange2         NotApplicable   ImapCTPMonitor       MSExchangeImap4      IMAP            Unhealthy  None

[PS] C:\Windows\system32>Invoke-MonitoringProbe IMAP\ImapCTPProbe -Server exchange2 | Format-List
WARNING: No mailboxes were found to use in the CTP probe.
[PS] C:\Windows\system32>

Thanks

John

Hi,

According to your description, I understand that get an warning with IMAP is unhealthy, and run Invoke-MonitoringProbe get an error No mailboxes were found to use in the CTP probe.
If I misunderstand your concern, please do not hesitate to let me know.

This issue may be issued on CAS servers.
Please try below steps to troubleshooting your question:
1. Restart the Exchange IMAP4 service on the backend server.
2. Run below command to turn on IMAP protocol logging to help resolve issue:
   a. Enable logging: Set-ImapSettings -server <CAS server name> -ProtocolLoggingEnabled $true
   b. Get the location of log file and mailbox server: Get-ImapSettings -server <CAS server name>
   c. Check IMAP service in Mailbox server: Get-ServerHealth mailbox1.contoso.com | ?{$_.HealtSetName -like "IMAP*"}
3. If the Mailbox server is reported as healthy, restart the CAS.
4. After restart CAS server, restart IMAP service and disable protocol logging.
More details about Troubleshooting IMAP Health Set, for you reference:
https://technet.microsoft.com/en-us/library/ms.exch.scom.imap%28v=exchg.150%29.aspx?f=255&MSPPError=-2147217396

Thanks