Andre,
Can you open a ticket with the GTAC so we can try and replicate this issue? If you log in to the Extranet you can open a ticket on line.
https://extranet.enterasys.com/Pages/default.aspx
Make sure you generate a tech support file from the controller on "logs" so we can review the configuration you currently have setup and attach it to the case ticket.
Thanks,
Doug
Doug Hyde
Director, Technical Support / Extreme Networks