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How do I configure ISA Server to allow client PC to establish VPN to outside Server?

I am having a problem allowing a client inside of my network to connect to a remote Server running VPN services. The problem seems to be that the request goes out from this client but when trying to get a reply from the VPN Server it can't get thru my ISA Server. I do have this server setup as a Proxy. I opened ports 1701 UDP, 1723 TCP for L2TP Traffic. I also opened ports 4500 udp, and 500 udp for IPSEC traffic. I also enabled "pptp through ISA firewall".
Any help would be appreciated.

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compunet99
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compunet99
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Pentrix2Commented:
What ISA server are you using, and what type of VPN Server/vendor/technology are you using as well?
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compunet99Author Commented:
The ISA Server is Windows 2000 ISA Server. The VPN Server is not known but we are using the Windows VPN Client. Hope that helps.
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kpillerCommented:
You can try this.

http://support.microsoft.com/default.aspx?scid=kb%3Ben-us%3B818043

It is a fix to allow better L2TP connections from a NAT. That may very well be the connection type as it has issues coming from a NAT.
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compunet99Author Commented:
Whenever this person attempts a connection using a wireless isp connection on the laptop, it works fine, it's just when they try to connect from inside our network that they have the problem.
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kpillerCommented:
That would be the case. L2TP does not like to connect from inside a network. That is why they put the above update out.
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compunet99Author Commented:
Do I have to upgrade to Service Pack 2 to get this particular fix? The reason I ask is that this office runs a lot of applications that are not standard Microsoft products. I'm afraid that I will have problems with incompatability with SP2.

Thanks
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kpillerCommented:
Not that I know of and I have not used the fix. I currently run PPTP client connection from other networks and it works fine but I am going to want them to use L2TP and anticipate needing this. If they are using L2TP it may help.
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