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Event ID: 4027 Source: MSExchange ADAccess

MSExchange ADAccess
Process w3wp.exe (PID=16520). WCF request (Report Server Down to the Microsoft Exchange Active Directory Topology service on server (TopologyClientTcpEndpoint (localhost)) failed. Make sure that the service is running. In addition, make sure that the network ports that are used by Microsoft Exchange Active Directory Topology service are not blocked by a firewall. The WCF call was retried 1 time(s). Error Details
System.ServiceModel.FaultException`1[System.ArgumentException]: The value is set to null or empty
Nazwa parametru: serverName (Szczegól bledu: System.ArgumentException: The value is set to null or empty
Nazwa parametru: serverName
   w Microsoft.Exchange.Diagnostics.ArgumentValidator.ThrowIfNullOrEmpty(String name, String arg)
   w Microsoft.Exchange.Directory.TopologyService.TopologyService.InternalReportServerDown(String partitionFqdn, String serverName, ADServerRole role)
   w Microsoft.Exchange.Directory.TopologyService.TopologyService.ExecuteServiceCall(Action action)).

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