nas down, hanging radius users

Hi,

I have a poptop PPTP server using a FreeRADIUS server thats using MySQL.

When the PPTP server goes down (server crash or network outage) then the 
FreeRADIUS still thinks they're logged in as it never receives a STOP message. 
Since I have muliple-logins not allowed, the users can not login again :-( 
Right now I have to manually go into the MySQL DB and basically delete the 
entries that have 'acctsessiontime=0' in the radacct table, in order for the 
users to be able to login again.

So am I the first having this problem (hardly!) and what can be done about it? 
The FreeRADIUS people seem to mostly say 'It's the NAS's fault!' so no dice 
there.  I need a small utility/script to send the STOP packet to RADIUS or 
another packet that will clear up that session or some sort of reset-button. 

Anybody? (this is urgent by the way, thanks!) 

Regards,
Tobias

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