EAP-TTLS first connection works, other won't

[Giovanni Lovato]

I set up freeradius 2.1.1 for EAP-TTLS, on Debian Lenny. As client I'm 
using Ubuntu. When I try to connect, first user, (on the logs, "heruan") 
connect successfully, but subsequent users (e.g. "jamila") won't. If I 
restart freeradius, and try to connect first with "jamila" and then with 
"heruan", "jamila" connects and "heruan" doesn't. The only error I'm 
able to see on the log is:

798:[ttls] FAIL: Forcibly stopping session resumption as it is not allowed.
799-[eap] Freeing handler
800-++[eap] returns reject
801-Failed to authenticate the user.
802-Using Post-Auth-Type Reject
803-+- entering group REJECT {...}

But I really don't know what it means.
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