Symptoms
Tasks to change IIS application pool settings fail with the following error:
Last execution output Destination host 'winweb02.hosting.local' (#25), IP '172.29.1.73' : Provisioning request failed. The authentication service is unknown. [<response><errorContext description="Could not open metabase key. IIS://winweb02.hosting.local/W3SVC/AppPools/ex_p00100283 0x800706d3: The authentication service is unknown." code="0x800706d3" executeSeqNo="1"><errorSource namespace="IIS Provider" procedure="SetProperties"/></errorContext></response>]
The following error can be found in the log on MPS server:
Feb 7 05:24:21 WINWEB02 : DBG [1:13763:b6c7eba0:73385 25:1744:1d78 pleskd]: Mpf request response: The authentication service is unknown. [<response><errorContext description="Could not open metabase key. IIS://winweb02.hosting.local/W3SVC/AppPools/ex_p00100283 0x800706d3: The authentication service is unknown." code="0x800706d3" executeSeqNo="1"><errorSource namespace="IIS Provider" procedure="SetProperties"/></errorContext></response>]
Cause
MPS server cannot connect remotely to webserver and authorize in order to make operation in IIS. For more information you may check EventViewer on MPS server and find related errors there for the time when the task was executed.
Resolution
Restart MPS service according to instructions from the article https://kb.cloudblue.com/1851