Exch2k13 (C.U 4) - PShell and G.U.I not available and with error

Hi,

we have all users accessing outlook with no issues, all users using mobile fine also. But this morning when we tried to access the 'Exchange Toolbox' shows the following msg.

Unhandled Exception in Managed Code Snap-in

FX:{714FA079-DC14-470f-851C-B7EAAA4177C1}

Exception type: System.Runtime.Serialization.SerializationException

Exception stack trace:

   at Microsoft.ManagementConsole.Internal.IMessageClient.ProcessRequest(Request request)
   at Microsoft.ManagementConsole.Executive.RequestStatus.BeginRequest(IMessageClient messageClient, RequestInfo requestInfo)
   at Microsoft.ManagementConsole.Executive.SnapInRequestOperation.ProcessRequest()
   at Microsoft.ManagementConsole.Executive.Operation.OnThreadTransfer(SimpleOperationCallback callback)

After this, we tried to use the PShell but is shows the following msg:

VERBOSE: Connecting to DCSRV13.matriz.company.br.
New-PSSession : [dcsrv13.matriz.company.br] Connecting to remote server dcsrv13.matriz.company.br failed with the
following error message : Access is denied. For more information, see the about_Remote_Troubleshooting Help topic.
At line:1 char:1+ New-PSSession -ConnectionURI "$connectionUri" -ConfigurationName Microsoft.Excha ...+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~+ CategoryInfo          : OpenError: (System.Manageme....RemoteRunspace:RemoteRunspace) [New-PSSession], PSRemotin
   gTransportException+ FullyQualifiedErrorId : AccessDenied,PSSessionOpenFailed
Failed to connect to an Exchange server in the current site.
Enter the server FQDN where you want to connect.:

Does anyone idea on how to throubleshooting this?

I found similar posts like this issue but I´m able to open the '/ECP' website fine.

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http://social.technet.microsoft.com/Forums/office/en-US/9ef62926-086b-49e6-bc2e-bcaf3eca7c3e/exchange-2013-unable-to-start-exchange-toolbox?forum=exchangesvrdeploy

http://www.experts-exchange.com/OS/Microsoft_Operating_Systems/Server/Q_28201708.html