Windows XP and VPN

[Guest]

I have a Windows XP Professional (SP1) behind a broadband
access point and LinkSys BEFSR41 Broadband outer/Firewall.
I have created an Incoming Connection using VPN. I have
also forwarded port 1723 to the private IP of the WinXP
Computer.

I am not able to connect. I get to "Verifying Username and
Password". When I run "netstat -an" from the remote
omputer, it says that the connection is established. After
about 15 seconds, the connection disconnects and get an
Error 678: Computer not responding. I do, however, see
that data is coming in on port 1723 in the Firewall log.

On the outgoing log, data is coming back to the remote IP
on numerous ports 2036 or 4603 or some other port.

Scenario:
I am in the office and I need to dial-in to my XP computer
at home over VPN. Then I can map drive, start RDP, etc.

What am I doing wrong?

 

[Jeffrey Randow (MVP)]

You need to enable PPTP Passthrough/GRE in your router (each firmware
release is different).

Jeffrey Randow (Windows MVP - Networking & Smart Display)
(e-mail address removed)

Please post all responses to the newsgroups for the benefit
of all USENET users. Messages sent via email may or may not
be answered depending on time availability....

Remote Networking Technology Wiki -
http://www.remotenetworktechnology.com
Smart Display Support - http://www.smartdisplays.net
Windows XP Expert Zone - http://www.microsoft.com/windowsxp/expertzone

 

[Michael Ko]

If you have forwarded port 1723 and enable PPTP pass through and still
got stuck at "Verifying Username and Password", then the problem is
your Linksys BEFSR41 router firmware does not allow GRE traffic to
passthrough (This is when verifiy Username and Password taking place)

I have same router that I have tested only firmware version earlier
than 1.44.2 (include) works for PPTP pass through. 1.45.6 and 1.45.7
does not work.

My testing result:
v1.42.7 4/2/2002 GRE OK with PPTP passthrough.
v1.43 9/4/2002 GRE OK with PPTP passthrough.
v1.43.3 11/15/2003 GRE OK with PPTP passthrough. Need port trigging
47~47 1723~1723

v1.44 11/21/2003 GRE OK with PPTP passthrough.
v1.44.2 12/13/2003 GRE OK with PPTP passthrough.
v1.45.6 6/24/2003 GRE NO with PPTP passthrough.
v1.45.7 7/31/2003 GRE NO with PPTP passthrough.

To downgrade Linksys BEFSR41 Router to 1.44.2:
ftp://ftp.linksys.com/pub/befsr41/
file name befsr-fw-1442.zip.

Good Luck!