Can I capture VPN disconnects using log in Windows Server 2003 IAS RADIUS

I have been asked to create a simple log of VPN usage. My plan was to track connection time and disconnection time and use Excel to provide a "VPN usage" figure.  I am using Windows Server 2003 IAS/RADIUS for remote access policy.  I have turned on the authentication and accounting logging features.  This seems to give me a log of the user "connecting" and authenticating.  Is there any way to include the disconnection in the log?  The RADIUS client is a Cisco ASA 5510.  Should I use syslogs from the firewall?  Any help is appreciated.

JHB_ITAsked:
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Craig BeckConnect With a Mentor Commented:
I would use the logs from the VPN concentrator (ASA 5510).  You will only see authentication logs for the initial connection in RADIUS as the disconnect doesn't need to be authorised.
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JHB_ITAuthor Commented:
That is what I need to know.  Thanks.
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