Blocking FTP by username

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Is there any way in ISA 2006 to disconnect an FTP session when they *attempt*
to authenticate as a particular user? What we want to do, is to detect that
someone is trying to connect as "Administrator" and cut them off immediately.
It looks like doing a user-based Deny in the rule will wait until they are
authenticated, we do not want the attempt to even get to our FTP server.

Thanks!

J.Ja
.

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