My ethernet port on the thunderbolt display doesn't work anymore.

I recently updated to 10.8.4 on a Mac book pro. I use it docked on a thunderbolt display.
The ethernet cable is plugged into the display.
Today I switch the computer on and the dot for ethernet remains orange with "etat inconnu". I tried to reboot, unplug the display nothing worked. I know the ethernet cable works fine.
Anyone has any idea?
Thanks,

You could try unplugging the TB display for a few seconds and then plug back in.  If that does not work go to preferences, network and remove the ethernet display and then add the ethernet display (using the + at the bottom).  See if that works.  I had to do that on mine to fix a similar issue.

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