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TMG VPN RADIUS Authentication

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TMG VPN RADIUS Authentication - 14.May2013 8:59:42 AM   


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Joined: 14.May2013
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I have recently set up a TMG to provide VPN remote access to users, using RADIUS authentication and one time passwords. We've seen something very odd and I wondered if anyone else had seen it at all.

Basically, when the user inputs the correct passcode they are allowed access, or if they input the incorrect passcode they are not. However, if they leave the passcode field blank and submit, the RADIUS server returns an "Access-Challenge" response, but instead of the user being asked to input a new passcode TMG seems to take the "Access-Challenge" response as an "Access-Accept" and lets the user in! Effectively the user gets access to the internal network by leaving the passcode field blank!

Has anyone else seen this at all? Any thoughts on how to block a blank password or pass on the challenge to the user?

Many thanks in advance.

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