In reference to your response regarding how to extend a firewall to remote users: Why does no one ever consider...
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MS Terminal Server via TSAC? Nothing to configure, all you need is IE4.x or higher on the remote user stations, and you can maintain 128bit rdp. I can't imagine getting my people to determine their IP number from some hotel to log into our services via the VPN. We just point them to a URL, and away they go. Now the only drawback is dealing with hotels that feel you only need port 80 and 443 open at their firewall.
The main reason that I can think of is that there have been security vulnerabilities noted in RDP, and Microsoft's attempts to fix them have caused problems. (ref: http://www.internetnews.com/dev-news/article/0,,10_907031,00.html)
Many administrators would simply rather use a third party VPN than rely on Microsoft for their security.
Most third party VPN clients do not require a user to determine their IP address. They are designed to operate in a dial-up or foreign network with whatever IP address the computer is given.
For more information on this topic, visit these other searchSecurity resources:
Best Web Links: Virtual Private Networks
Best Web Links: Mobile/Remote Employee Issues
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