Hello, I have problems managing Exchange 2010 from a trusted / foreign domain. I can login to all servers with the trusted account (also the Exchange servers) DNS is resolving the trusted domain Wins is not replicating (can this be the problem? WINS is not in use at the trusted domain) I have followed http://technet.microsoft.com/en-us/library/dd876871.aspx With a local account I have no problems managing Exchange (even a very new account) When query the trusted user for powershell enabled it tells me $true The problem is with EMS and EMC The problem is locally on the Exchange servers and on a management server in the same domain as the Exchange servers to manage When opening EMS it is connecting quite nicely to the Exchange 2010 server in the trusted domain after giving errors on the servers in the domain to manage Al ports between the Exchange servers and the DC's + Exchange server in the trusted domain are open The exact error I get is: VERBOSE: Connecting to EXCAS001.domain.local [EXCAS001.domain.local] Connecting to remote server failed with the following error message : WinRM cannot process the request. The following error occured while using Kerberos authentication: The network path was not found. Possible causes are: -The user name or password specified are invalid. -Kerberos is used when no authentication method and no user name are specified. -Kerberos accepts domain user names, but not local user names. -The Service Principal Name (SPN) for the remote computer name and port does not exist. -The client and remote computers are in different domains and there is no trust between the two domains. After checking for the above issues, try the following: -Check the Event Viewer for events related to authentication. -Change the authentication method; add the destination computer to the WinRM TrustedHosts configuration setting or use HTTPS transport. Note that computers in the TrustedHosts list might not be authenticated. -For more information about WinRM configuration, run the following command: winrm help config. For more information, see the about_Remote_Troubleshooting Help topic. + CategoryInfo : OpenError: (System.Manageme....RemoteRunspace:RemoteRunspace) [], PSRemotingTransportException + FullyQualifiedErrorId : PSSessionOpenFailed VERBOSE: Connecting to EXMB001.domain.local [exmb001.domain.local] Connecting to remote server failed with the following error message : WinRM cannot process the request. The following error occured while using Kerberos authentication: The network path was not found. Possible causes are: -The user name or password specified are invalid. -Kerberos is used when no authentication method and no user name are specified. -Kerberos accepts domain user names, but not local user names. -The Service Principal Name (SPN) for the remote computer name and port does not exist. -The client and remote computers are in different domains and there is no trust between the two domains. After checking for the above issues, try the following: -Check the Event Viewer for events related to authentication. -Change the authentication method; add the destination computer to the WinRM TrustedHosts configuration setting or use HTTPS transport. Note that computers in the TrustedHosts list might not be authenticated. -For more information about WinRM configuration, run the following command: winrm help config. For more information, see the about_Remote_Troubleshooting Help topic. + CategoryInfo : OpenError: (System.Manageme....RemoteRunspace:RemoteRunspace) [], PSRemotingTransportException + FullyQualifiedErrorId : PSSessionOpenFailed I am running out of options. Does anyone have an idear / solution? Thank you in advance for your support.