Exchange server 仅在IIS承载的应用程序中远程连接到Exchange时引发异常

我希望有人能帮助我，我有以下功能可以远程调用powershell服务器：

    private static string DoCall()
    {        
        string resultPs = string.Empty;
        string serverName = "myserver.com";
        string SHELL_URI = "http://schemas.microsoft.com/powershell/Microsoft.Exchange";
        System.Uri serverUri = new Uri(String.Format("http://{0}/powershell?serializationLevel=Full", serverName));
        WSManConnectionInfo connectionInfo = new WSManConnectionInfo(serverUri, SHELL_URI, (PSCredential)null);
        //connectionInfo = new WSManConnectionInfo(serverUri, SHELL_URI, PSCredential.Empty);                        
        //connectionInfo.AuthenticationMechanism = AuthenticationMechanism.Kerberos;
        try
        {
            using (Runspace runspace = RunspaceFactory.CreateRunspace(connectionInfo))
            {
                PowerShell powershell = PowerShell.Create();
                powershell.Runspace = runspace;
                runspace.Open();
                powershell.AddScript("Get-DatabaseAvailabilityGroup");
                Collection<PSObject> results = powershell.Invoke();
                if (powershell.Streams.Error.Count > 0)
                {
                    foreach (ErrorRecord err in powershell.Streams.Error)
                    {
                        resultPs += (err.ErrorDetails.Message != null ? err.ErrorDetails.Message : "");
                    }
                }

                foreach (PSObject result in results)
                {
                    foreach (PSPropertyInfo propertyInfo in result.Properties)
                    {
                        resultPs += "Property:" + propertyInfo.Name + " Value:" + propertyInfo.Value;
                    }
                }
                powershell.Runspace.Close();
            }
        }
        catch (Exception ex)
        {
            resultPs = ex.Message + " " + ex.StackTrace + "     innerException: " + (ex.InnerException != null ? (ex.InnerException.Message ?? "") : "");
        }            
        return resultPs;        
    }
}

我查看了几篇关于传递凭证的博客，但我没有发现有人有同样的问题，这解决了我的问题。我知道我可以使用重载方法初始化凭据，但我想使用应用程序池中的方法

"An internal error occurred. \0    at System.Management.Automation.Remoting.Client.WSManClientSessionTransportManager.Initialize(Uri connectionUri, WSManConnectionInfo connectionInfo)\r\n   at System.Management.Automation.Remoting.Client.WSManClientSessionTransportManager..ctor(Guid runspacePoolInstanceId, WSManConnectionInfo connectionInfo, PSRemotingCryptoHelper cryptoHelper)\r\n   at System.Management.Automation.Remoting.ClientRemoteSessionDSHandlerImpl..ctor(ClientRemoteSession session, PSRemotingCryptoHelper cryptoHelper, RunspaceConnectionInfo connectionInfo, URIDirectionReported uriRedirectionHandler)\r\n   at System.Management.Automation.Remoting.ClientRemoteSessionImpl..ctor(RemoteRunspacePoolInternal rsPool, URIDirectionReported uriRedirectionHandler)\r\n   at System.Management.Automation.Internal.ClientRunspacePoolDataStructureHandler..ctor(RemoteRunspacePoolInternal clientRunspacePool, TypeTable typeTable)\r\n   at System.Management.Automation.Runspaces.Internal.RemoteRunspacePoolInternal..ctor(Int32 minRunspaces, Int32 maxRunspaces, TypeTable typeTable, PSHost host, PSPrimitiveDictionary applicationArguments, RunspaceConnectionInfo connectionInfo)\r\n   at System.Management.Automation.Runspaces.RunspacePool..ctor(Int32 minRunspaces, Int32 maxRunspaces, TypeTable typeTable, PSHost host, PSPrimitiveDictionary applicationArguments, RunspaceConnectionInfo connectionInfo)\r\n   at System.Management.Automation.RemoteRunspace..ctor(TypeTable typeTable, RunspaceConnectionInfo connectionInfo, PSHost host, PSPrimitiveDictionary applicationArguments)\r\n   at System.Management.Automation.Runspaces.RunspaceFactory.CreateRunspace(RunspaceConnectionInfo connectionInfo, PSHost host, TypeTable typeTable, PSPrimitiveDictionary applicationArguments)\r\n   at TestingRemote.Service.DoCall() in "