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I have set up VPN on windows 2000 server. I am using windows 98 vpn adapter to connect to the server through leased line. After I set the ipsec filter (port number 500 and 1701), I am not able to connect to the server. The error is the connection isdisconnected. What are the ports (tcp, udp, etc) that are needed to be enabled at the server to allow the windows 98 to connect to the server ?

Thank you

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Packet Filtering

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If I’m not mistaken, IPSec uses an IP protocol, not a tcp/udp protocol. the 500 and 1701 that you mention are “setup” ports, but the actual encrypted traffic runs over IP protocol XX. (sorry you’ll have to look that one up, i believe the protocol name is ESP)

This is akin to ICMP. It is an IP protocol that has no relationship to TCP/UDP port numbers.

Someone please correct me if I’m way off on this one. It’s been a couple of months since my last VPN project.

Packet Filtering

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Only WINDOWS 200O CLIENTS can use L2TP (which uses ports 500 and 1701)

Windows 98 clients connect to a 2000 VPN server via PPTP ONLY, which uses TCP 1723 and Protocol 47 (GRE).

See the VPN Whitepapers for Windows 2000 on MS website. Also, if you like, I have several article IDs from the Windows 2000 Magazine website that may help you.

Hope this Helps, Email if more questions

Pete Zerger, MCSE, CCA
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