I have an Exchange server, which until recently was being monitored fine. Then two sensors went down over the weekend related to WinRM/Powershell and I'm struggling to resolve the issue. I deleted one sensor and tried to re-create it, but got this error:
The Sensor can not connect to the Device using Remote-PowerShell. Ensure that remote management is enabled on the Exchange Server and the user-name and password is correct. See http://kb.paessler.com/knowledgebase/en/topic/54353 for details. Connecting to remote server autodiscover.domain.co.uk failed with the following error message : WinRM cannot process the request. The following error occurred while using Kerberos authentication: The computer autodiscover.domain.co.uk is unknown to Kerberos. Verify that the computer exists on the network, that the name provided is spelled correctly, and that the Kerberos configuration for accessing the computer is correct. The most common Kerberos configuration issue is that an SPN with the format HTTP/autodiscover.domain.co.uk is not configured for the target. If Kerberos is not required, specify the Negotiate authentication mechanism and resubmit the operation. For more information, see the about_Remote_Troubleshooting Help topic.
I believe the problem is because PRTG is reporting an issue connecting to autodiscover.domain.co.uk, but the device object is exchangeserver.domain.co.uk
It seems the PRTG server is not resolving the device name correctly and trying to connect to the autodiscover IP.
The Exchange server has a separate IP addresses for autodiscover. Having double-checked DNS, both the forward and reverse lookups are all correct. And when I ping the names from the PRTG server, the correct IP's are returned. What could be going wrong?