Hi, Mikael.
Are you following the Networks Requirements, which includes: "HTTPS traffic must be allowed through your firewall on port 443 for ExtremeCloud-managed APs
and switches to connect to ExtremeCloud and receive their configuration, software updates and
send analytics."
This info is located in the ExtremeCloud Information Center and QRG at
http://www.extremenetworks.com/support/documentation/
Hope this helps. If not, you might want to contact Extreme's GTAC team at
http://support.extremenetworks.com/
Jonquil Williams
Extreme Networks
Lead Technical Writer, Information Development