Can't restart cRio 9074 with Automation & Measurement Explorer

Hi,

First, excuse me if my question is trivial, i'm new with National Instrument communication.

I need to restart a distant cRio 9074, programmed with labview 8.6.1. I installed NI-RIO 4.0, and I can see - very slowly - the cRio in Measurement & Automation Explorer V5.0. However, it stays "disconnected", and the "restart" command is disabled.

Any idea?

Thomas