VPN stopped working

[gerritvn1945]

A VPN connection from my computer running WinXP Pro SP2 which used to
work for a couple of years, stopped working. I uninstalled and
recreated the VPN connection with no success.

I then tried it on another computer in the same LAN using a NAT router
for access to the Internet and it works without a problem. How can I
fix my computer short of wiping all the disks and re-installing
everything?

I tried it with and without the firewall enabled. Any help will be
appreciated.

 

[Robert L [MVP - Networking]]

What's the error code?

Bob Lin, MS-MVP, MCSE & CNE
Networking, Internet, Routing, VPN Troubleshooting on http://www.ChicagoTech.net
How to Setup Windows, Network, VPN & Remote Access on http://www.HowToNetworking.com
A VPN connection from my computer running WinXP Pro SP2 which used to
work for a couple of years, stopped working. I uninstalled and
recreated the VPN connection with no success.

I then tried it on another computer in the same LAN using a NAT router
for access to the Internet and it works without a problem. How can I
fix my computer short of wiping all the disks and re-installing
everything?

I tried it with and without the firewall enabled. Any help will be
appreciated.

 

[gerritvn1945]

What's the error code?

The error code is 800, which does not really help much.
Here is an Ethereal trace of the attempted connection. My PC is
192.168.0.8.

No. Time Source Destination
Protocol Info
1 0.000000 192.168.0.8 66.192.186.18
TCP 9584 > pptp [SYN] Seq=0 Len=0 MSS=1460
2 0.408009 66.192.186.18 192.168.0.8
TCP pptp > 9584 [SYN, ACK] Seq=0 Ack=1 Win=16384 Len=0 MSS=1450
3 0.408130 192.168.0.8 66.192.186.18
PPTP Start-Control-Connection-Request
4 0.818971 66.192.186.18 192.168.0.8
PPTP Start-Control-Connection-Reply
5 3.305154 192.168.0.8 66.192.186.18
PPTP [TCP Retransmission] Start-Control-Connection-Request
6 3.715875 66.192.186.18 192.168.0.8
TCP [TCP Dup ACK 4#1] pptp > 9584 [ACK] Seq=157 Ack=157 Win=65379
Len=0
7 3.860027 66.192.186.18 192.168.0.8
PPTP [TCP Retransmission] Start-Control-Connection-Reply
8 9.340294 192.168.0.8 66.192.186.18
PPTP [TCP Retransmission] Start-Control-Connection-Request
9 9.751163 66.192.186.18 192.168.0.8
TCP [TCP Dup ACK 7#1] pptp > 9584 [ACK] Seq=157 Ack=157 Win=65379
Len=0
10 9.868698 66.192.186.18 192.168.0.8
PPTP [TCP Retransmission] Start-Control-Connection-Reply
11 21.309989 192.168.0.8 66.192.186.18
PPTP [TCP Retransmission] Start-Control-Connection-Request
12 21.722005 66.192.186.18 192.168.0.8
TCP [TCP Dup ACK 10#1] pptp > 9584 [ACK] Seq=157 Ack=157
Win=65379 Len=0
13 21.796600 66.192.186.18 192.168.0.8
PPTP [TCP Retransmission] Start-Control-Connection-Reply
14 30.427726 192.168.0.8 66.192.186.18
ISAKMP Identity Protection (Main Mode)
15 31.336388 192.168.0.8 66.192.186.18
ISAKMP Identity Protection (Main Mode)
16 33.336371 192.168.0.8 66.192.186.18
ISAKMP Identity Protection (Main Mode)
17 37.336355 192.168.0.8 66.192.186.18
ISAKMP Identity Protection (Main Mode)
18 45.336329 192.168.0.8 66.192.186.18
ISAKMP Identity Protection (Main Mode)
19 45.349943 192.168.0.8 66.192.186.18
PPTP [TCP Retransmission] Start-Control-Connection-Request
20 45.762588 66.192.186.18 192.168.0.8
TCP [TCP Dup ACK 13#1] pptp > 9584 [ACK] Seq=157 Ack=157
Win=65379 Len=0
21 45.968794 66.192.186.18 192.168.0.8
PPTP [TCP Retransmission] Start-Control-Connection-Reply
22 61.336288 192.168.0.8 66.192.186.18
ISAKMP Identity Protection (Main Mode)
23 93.329328 192.168.0.8 66.192.186.18
PPTP [TCP Retransmission] Start-Control-Connection-Request
24 93.336552 192.168.0.8 66.192.186.18
ISAKMP Informational
25 93.730251 66.192.186.18 192.168.0.8
TCP [TCP Dup ACK 21#1] pptp > 9584 [ACK] Seq=157 Ack=157
Win=65379 Len=0
26 94.076433 66.192.186.18 192.168.0.8
TCP pptp > 9584 [RST] Seq=1 Len=0

 

[gerritvn1945]

Bob, I followed your troubleshooting link and came to the conclusion
that the problem is Norton Antivirus 2007. When I turn off the
Internet protection features, I get further, but it still does not
work. Error code 721 this time and the trace shows that PPP LC
Configuration Acknowledgement is never received; probably still
blocked by Norton
The Symantec support is not the best in the world - quite the
opposite; I could not get much help from their site.
Anybody who can help?

 

[gerritvn1945]

Sorted out the problem (sort of). After turning off the Norton
Internet protection features, you have to REBOOT your computer. Now
VPN works again, but how do I get VPN and Internet protection at the
same time?

 

[Robert L [MVP - Networking]]

This case studies may help,

Case Studies - VPN error 721 and 800However, he can't access the VPN from the Internet and receives error 800. ... you use Norton secure software, you may need to add the remote client's IP so ...
http;//www.chicagotech.net/VPN/vpncase800.htm


Bob Lin, MS-MVP, MCSE & CNE
Networking, Internet, Routing, VPN Troubleshooting on http://www.ChicagoTech.net
How to Setup Windows, Network, VPN & Remote Access on http://www.HowToNetworking.com
Sorted out the problem (sort of). After turning off the Norton
Internet protection features, you have to REBOOT your computer. Now
VPN works again, but how do I get VPN and Internet protection at the
same time?

 

[gerritvn1945]

I contacted Symantec and was told that is a known bug in Norton
Antivirus 2007. Downloading the latest version and updates (50 Mb)
fixed the problem. I am now running Version 14.2.0.29.

Thanks for your help which pointed me in the right direction.

 

[Robert L [MVP - Networking]]

Thank you for the update.

Bob Lin, MS-MVP, MCSE & CNE
Networking, Internet, Routing, VPN Troubleshooting on http://www.ChicagoTech.net
How to Setup Windows, Network, VPN & Remote Access on http://www.HowToNetworking.com
I contacted Symantec and was told that is a known bug in Norton
Antivirus 2007. Downloading the latest version and updates (50 Mb)
fixed the problem. I am now running Version 14.2.0.29.

Thanks for your help which pointed me in the right direction.