Re: VPN ports

Tech-Archive recommends: Repair Windows Errors & Optimize Windows Performance

From: Steven L Umbach (n9rou_at_nospam-comcast.net)
Date: 06/21/04 

Date: Mon, 21 Jun 2004 18:42:39 GMT

Hi Miha.

Pptp requites tcp 1723 and protocol 47/gre which sometimes is referred to as pptp
passthrough.

L2tp requires udp 1701 and udp 500/IKE and also udp 4500 if NAT-T is used. Keep in
mind that l2tp will not work through a NAT device unless you are using the NAT-T
client on the client computer into a W2003 rras vpn server. The links below may
help. --- Steve

http://www.microsoft.com/resources/documentation/WindowsServ/2003/enterprise/proddocs/en-us/Default.asp?url=/resources/documentation/WindowsServ/2003/enterprise/proddocs/en-us/sag_vpn_und13.asp
http://tinyurl.com/32jzv --- same link as above, shorter.
http://support.microsoft.com/default.aspx?scid=kb;en-us;818043

"Miha Bernik" <miha.bernik@gvskupina.si> wrote in message
news:u%23KHBd7VEHA.644@tk2msftngp13.phx.gbl...
> Hi
>
> Can someone please explain me, which ports do I need to open on our
> company's firewall so that users could connect to our local VPN server
> (running on Windows Server 2003)??
> As I see for now, 1723 would be the right for PPTP?
> But what about L2TP (IPSec)?? I red, that there must be also a 500 UDP port
> and some kind of GRE protocol ???
>
> Thanks for help
> Regards
> Miha
>
>

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