I also have problems. See
http://discussions.apple.com/thread.jspa?threadID=2348215&tstart=0
It seams that it depends on the authentication protocol used. I can connect to Eduroam if I use an account that uses TTLS at the home server like SUFRNet or RuG, but not to my own home institute (ASTRON), which uses PEAP-MSCAHPv2 authentication.
Is seems something goes wrong in the authentication protocol negotiation. It worked fine on 10.4/Tiger and on my iPhone, it's specifically Snow Leopard that's broken.
Is your institute also using PEAP-MSCHAPv2, or is it using something else?
If Iker Exebarria can connect, please tell us how you solved it. I've tried everything I could find.
Message was edited by: Adriaan Renting