Microsoft PPTP Clients Cannot Authenticate

Remote users with Microsoft PPTP cannot successfully authenticate through a Microsoft ISA 2000 Server running Routing and Remote Access.� They are told that their username and password were not accepted.� The ISA Server's System Log shows the following errors:
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Event Type:�Warning
Event Source:�RemoteAccess
Event Category:�None
Event ID:�20189
Date:��4/25/2004
Time:��8:46:16 PM
User:��N/A
Computer:�ISA-Server
Description:
The user Domain\JoeUser connected from 123.123.123.123 but failed an authentication attempt due to the following reason: There was an authentication failure because of an unknown user name or a bad password.
For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.
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Check the following things.
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1.� The user is typing their username and password correctly.� Confirm that the user does not have their CAPSLOCK key on.
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2.� Verify that the NetLogon service is running on the ISA server.� The NetLogon service is responsible for passing the authentication thru to the domain controller.

Verifying Domain NetLogon Sychronization: http://support.microsoft.com/default.aspx?scid=kb;EN-US;149664

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