"EAP session ... did not finish!" with VPN connections

[Zeus V Panchenko]

Hi,
it is my another attempt to know, how to cope with 
`EAP session ... did not finish' warning ...

i have: 
OS: FreeBSD-8.x amd64
FreeRADIUS v.2.1.10

core freeradius configured with eap-tls, devices in my lan 
Symbian (Nokia E51,E52,E71,E72,E90)
Android (HTC DesireS)
Maemo (Nokia N900)
xNIX (ASUS EeePC900)
WindowsXP (various hardware)

receiving authorization and ip address via dhcp without any problem

but remote symbian devices behind vpn sometimes experience troubles ...

in `radiusd -X' output, the problem looks this way:

Going to the next request
Waking up in 4.9 seconds.
Cleaning up request 44 ID 6 with timestamp +3088
WARNING: !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
WARNING: !! EAP session for state 0x3866e92b3b62e4aa did not finish!
WARNING: !! Please read http://wiki.freeradius.org/Certificate_Compatibility
WARNING: !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Ready to process requests.

the same remote symbian device which experienced problems via vpn, is
experiencing no problem if i try to get authorization for it from lan

or if i install clone (the same version with the same configuration)
of core freeradius locally at the remote vpn side, than i can get
authorization for the device which was unable to get it with core
freeradius remotely

so, what can be the cause of this weird behaviour?

-- 
Zeus V. Panchenko
IT Dpt., IBS ltd			      	        GMT+2 (EET)