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Updated Oct 05, 2022
Version 9.0
Blog Post
14 MIN READ
New security feature in September 2021 Cumulative Update for Exchange Server
Hi,
just installed CU22.
The mitigation Service show me errors in Event Log (4999, 1008) :
An unexpected exception occurred. Diagnostic information:
ID : 1008
Exception encountered while fetching mitigations : System.Exception: This XML is not deemed safe to consume since Response xml's signing cert is invalid or not from microsoft
bei Microsoft.Exchange.Mitigation.Service.Common.SignatureVerifierUtils.ThrowIfIntegrityChecksFail(SafeXmlDocument xmlDoc)
bei Microsoft.Exchange.Mitigation.Service.Common.SignatureVerifierUtils.GetValidatedDocumentWithoutSignature(SafeXmlDocument xmlDoc)
bei Microsoft.Exchange.Mitigation.Service.Common.Utils.FetchDataFromXmlStream[T](Stream stream)
bei Microsoft.Exchange.Mitigation.Service.Common.Utils.FetchMitigationsFromUrl[T](String url, RemoteCertificateValidationCallback certValidationCallback, X509Certificate clientAuthCert, Boolean isResponseJson)
bei Microsoft.Exchange.Mitigation.Service.MitigationCloudServiceV2.FetchMitigations()
bei Microsoft.Exchange.Mitigation.Service.Mitigations.MitigationEngine.FetchAndApplyMitigation()
ID 4999
Watson report about to be sent for process id: 5824, with parameters: E12IIS, c-RTL-AMD64, 15.01.2375.007, M.E.Mitigation.Service, M.E.Mitigation.Service, M.E.M.S.C.SignatureVerifierUtils.GetValidatedDocumentWithoutSignature, System.Exception, 9784-dumptidset, 15.01.2375.007.
ErrorReportingEnabled: False
The Test-MitigationServiceConnectivity return a "Success" :
[PS] C:\Program Files\Microsoft\Exchange Server\V15\scripts>.\Test-MitigationServiceConnectivity.ps1
Result: Success.
Message: The Mitigation Service endpoint is accessible from this computer.
What's the Problem ?
Thanks