We run ACS 5-2-0-26-10. Some clients gets the error message "5411 EAP Session Timeout", and the clients are assigned guest LAN. If I reboot and log in again, still the same. However, if I reboot and log in with another user, it's back on the corporate network. Then I can log off and log in the user again, everything works fine. I haven't been able to find out why this happens. It's the machine authentication that fails, we have set our ACS to accept either user or machine ID. I also found out that if the user waits for about 20 minutes they're back on the corporate network. However I haven't found any timers that is set to this interval. I can't debug using Wireshark, because this is users that needs their computer right away, and I haven't been able to re-create the problem in lab neither.
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We have configured the outside and inside Interface with official ipv6 adresses, set a default route on outside Interface to our router, we also have definied a rule , which also gets hits, to permit tcp from inside Interface to any6.
In Syslog I also se...