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restrict microsoft vpn clients to one session per user

We have a Windows 2003 server configured for Routing and Remote Access.

The server is using Active Directory accounts for authentication.

We need a way to be able to restrict users to one session only as we have a large number of users and a limited number of available connections.

We have read the following article

http://blogs.technet.com/rrasblog/archive/2008/07/17/limit-one-connection-to-the-vpn-server-per-user.aspx

However, we are reluctant to introduce an unproven dll onto the system with the possibility that it may break RRAS.

We have also seen third party solutions such as

http://www.isdecisions.com/products/userlock/limits-concurrent-logins.htm

Here we canot get approval for the board to spend on a solution for this.

Does anyone have a suggestion as to how we can achieve this?

setasoujiro

you can try limitlogin, it's a tool from MS, refer to this:
http://msmvps.com/blogs/javier/archive/2005/03/14/38557.aspx

get it from here:
http://download.microsoft.com/download/f/d/0/fd05def7-68a1-4f71-8546-25c359cc0842/limitlogin.exe

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vodyanoi

ASKER

In the end we went away and assigned a static ip to each client.

In this way if multiple sessions were initiated using a particular account it just logged itself off from the earlier connected session.;