GRE is a protocol so you have to open up protocol 47.

--
Mark Swift
Microsoft/Windows/Networking/Secure Network Services/IP Security
Software Test Engineer

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"Brent Hammond" <nqcabigpond.com> wrote in message
news:088a01c33c58$3de6cb70$a101280aphx.gbl...
> Hello,
>
> New to VPN and am having great difficulty setting up NIS
> 2003 to permit VPN. Works fine when NIS is disabled
> on "Server" PC (running Windows XP Pro).
>
> Have tried enabling port 1723, but can not find any
> option for GRE 47??
>
> Has anybody setup this version of firewall for VPN. If so
> any tips greatly appreciated.
>
> Thanks