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Windows firewall stopping all traffic over VPN

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Björn Olsson

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Dec 7, 2007, 5:21:01 AM12/7/07
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When using a vpn connection (Microsoft built in) and windows firewall is on
the firewall drops packets and no traffic can go in/out over the vpn.

this is the log:
2007-12-07 11:07:35 DROP 47 130.241.192.42 130.241.5.52 - - 91 - - - - - - -
RECEIVE
2007-12-07 11:07:39 DROP 47 130.241.192.42 130.241.5.52 - - 113 - - - - - -
- RECEIVE

--
Best regards Björn Olsson
Head of Technology
Centre for Business Solutions
Gothenburg School of Economics and Commercial Law

Anteaus

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Jan 4, 2008, 8:14:00 PM1/4/08
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PPTP VPN uses TCP Port 1723, and UDP Port 1701.

It also uses Protocol 47. Note this is a protocol, not a port.

Your firewall (and router) must pass/forward all of these to the VPN server.

Jim Moreau

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Feb 25, 2008, 1:13:58 PM2/25/08
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Hello Anteaus and other group members,

Sorry to bother you all, but I am having a similar problem as Björn Olsson.
I have a VPN connection set up for the purposes of a secure remote desktop
connection to the VPN server (XP-PRO). The firewall is setup in the
Advanced Settings/Services menu to allow incoming VPN (PPTP and L2TP) as
well as remote desktop and ICMP ping is enabled. All of these settings work
fine on my local network from another rmachine. However, from a machine
outside our local network connected by VPN, with the firewall enabled on the
VPN server, I cannot ping the VPN server or remote connect to it. With the
firewall off it works fine.

The firewall log clearly shows the the remote connect and ping messages
being dropped. I tried to add the 2 ports you recommended to Björn Olsson
in your post below using the ADD feature on the ADVANCED SETTINGS menu of
the firewall, but I receive the error "The Port number is already used by
another entry" so it would seem VPN ports are already unmasked by the
firewall. This would be consistent with the fact that I can succesfully
make the VPN connection.

This same problem was also reported in the trancript
http://www.microsoft.com/windowsxp/expertzone/chats/transcripts/05_Feb09_wf.mspx ,
and a Microsoft moderator suggested to post the problem in this newsgroup,
but I can find no suggested solution other than yours below which does not
seem to be the problem for me.

I would welcome any further suggestions from any source.

Regards,
Jim Moreau


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