PSRemotingTransportException when invoking command on a distant server

Hello,

I'm having some trouble when I try to call Invoke-Command in powershell on a distant server.

I'm receiving a PSRemotingTransportException. It tells me that the user is either unknown or associated with a wrong password.

I've run the following commands on the distant server :

Set-ExecutionPolicy RemoteSigned
winrm quickconfig
Enable-PSRemoting

and the user is in the administrator group of the distant server.

When I try with another user, it works.

What I am missing ? Can anyone help me ?

Thanks in advance !