When you create a PPTP tunnel, the actual data is sent as an IP packet
with a GRE header. (GRE stands for Generic Routing Encapsulation). The data
packet is first encrypted, then encapsulated with the GRE header. The IP
address on the outside wrapper is a public IP address. (The private address
is part of the encrypted payload).
If the GRE packet has to pass through a router/firewall, this must be
configured to allow GRE in both directions. The VPN data passing through
this router will have GRE headers. If GRE is blocked in either direction,
the VPN connection will fail.
<(E-Mail Removed)> wrote in message
news:12d701c3df94$23c2d1f0$(E-Mail Removed)...
> Thanks for the fast response
>
> Can you help me with ip protocol 47 i do not understand
> what i need to do with it
> >-----Original Message-----
> >You do NOT want to open TCP port 47. You need to allow
> TCP port 1723 and IP
> >Protocol 47 (GRE). SOme firewalls call this "PPTP pass
> through"
> >
> >--
> >
> >Thanks,
> >Marc Reynolds
> >Microsoft Technical Support
> >
> >This posting is provided "AS IS" with no warranties, and
> confers no rights.
> >
> >
> >"Myronboy" <(E-Mail Removed)> wrote in
> message
> >news:12b901c3df6a$d187ef20$(E-Mail Removed)...
> >> I have a vpn server connected behind a "smoothwall 2.0
> >> express" firewall I mad a port forwarding for the ports
> >> 1723 and 47 to the server ipaddress. When i try to make
> a
> >> vpn connection to this server i get the following error
> >> code 721 The computer did not respond.
> >> Can someone help me with this issue.
> >>
> >
> >
> >.
> >
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