title: Error Unknown security using Remote PSSession CredSSP
body: <p>I have Windows 7 64 bits, and Powershell 2.0, and CredSSP enabled in client</p>
  
  <pre><code>Enable-WSManCredSSP -Role Client -DelegateComputer * -Force
  </code></pre>
  
  <p>I open Powershell Console, and I execute Enter-PSSession command to connect Windows 2008 Server using CredSSP authentication:</p>
  
  <pre><code>Enter-PSSession -Computername ServerMOSS -Authentication Credssp -Credential MyDomain\installerUser
  </code></pre>
  
  <p>I want execute Get-WSManCredSSP command remotely, but I get error: "... while using Negotiate authentication: An unknown security error occurred."</p>
  
  <pre><code>PS C:\Users\myUser&gt; Enter-PSSession -Computername ServerMOSS -Authentication Credssp -Credential MyDomain\installerUser
  
  [ServerMOSS]: PS C:\Users\installerUser\Documents&gt; Get-WSManCredSSP
  
  WinRM cannot process the request. The following error occured while using Negotiate authentication: An unknown security
   error occurred.
   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 us
  e 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.
      + CategoryInfo          :
      + FullyQualifiedErrorId : WsManError,Microsoft.WSMan.Management.GetWSManCredSSPCommand
  
  [ServerMOSS]: PS C:\Users\installerUser\Documents&gt; Exit-PSSession
  </code></pre>
  
  <p>IT departament execute this command in ServerMOSS:</p>
  
  <pre><code>PS C:\Users\installerUser\Documents&gt; enabled-psremoting -force
  </code></pre>
  
  <p>and they get error:</p>
  
  <pre><code>WinRM already is set upt to receive requests on this machine
  Set-WSManQuickConfig: WinRM cannot process the request. The following error occured while using Negotiate authentication: An unknown security error ocurred.
  </code></pre>
  
  <p>Any suggestions?</p>