BES EXpress: impossible to attach device to a user

Hi there,
I have a BES Express server
I want to use wired to activate user with device
I can not attached a device to a user
I get the message "The BlackBerry Administration Service was unable to retrieve specific device attributes from the device that is connected to your computer."
In the event log, I get

Nom du journal :Application
Source :       BlackBerry Dispatcher BBSERVER
Date :         01/10/2013 10:33:24
ID de l'événement :20574
Catégorie de la tâche :Aucun
Niveau :       Avertissement
Mots clés :    Classique
Utilisateur :  N/A
Ordinateur :
Description :
{SIMONETTI Fabien} RPC command failed - no connection to BES Agent
XML de l’événement :
<Event xmlns="">
    <Provider Name="BlackBerry Dispatcher BBSERVER" />
    <EventID Qualifiers="45055">20574</EventID>
    <TimeCreated SystemTime="2013-10-01T08:33:24.000Z" />
    <Security />
    <Data>{Name user} RPC command failed - no connection to BES Agent</Data>
Please help me
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Isn't the BES Express server there to serve them information over 3G ? Why not just activate it over 3G then?

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