Thanks for the speedy response pete.
Unfortunately we do not have direct access to the firewall.
Is there anything we can do here to enable the connection??
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Browse All TopicsI am having trouble connecting to a cisco vpn using client version 5.0.01.0600 from behind a firewall. The connection appears to connect and i am assigned an ip address, but i cannot browse to any ip addresses behind the firewall.
I am running vista on a pc in a SBS 2000 environment using the inbuilt software firewall and a binatone router.
I have opened ports 500 and 4500 on the router and the firewall as i read these were the ports the VPN client uses for traffic, but still no joy.
Any help or advice gratefully appreciated!
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You could try going into the connection profile properties, then the transport tab and changing the tunneling to ipsec over tcp but I doubt it will work properly. PeteLong is correct that any changes to get it working will likely need to be done on the firewall. Have you got correct DNS servers etc?
Good morning,
I have done further testing. The Cisco vpn software connects correctly, once the connection has been established I have tried:
- Pinging the ip address we are tring to reach and get an immediate time out response
- Tracert and this doesnt return anything and eventually times out
This would indicate the problem is an issue with all external IP requests being blocked by our firewall when the Cisco VPN software is active.
Thank you for time and patience,
If it is connected then it is almost certainly a configuration issue either on the servers at the VPN host end or the VPN head end firewall. The local firewall won't block the pings as they are encapsulated into the IPSEC traffic destined for the firewall. The local firewalls will only see encrypted IPSEC packets, not the pings.
Hi PeteLong,
As per the orginal post we can connect the vpn from inside our company network (on my laptop) however when we try to browse website hosted inside that network we get blocked at somepoint.
"The Cisco vpn software connects correctly, once the connection has been established I have tried:
- Pinging the ip address we are tring to reach and get an immediate time out response
- Tracert and this doesnt return anything and eventually times out"
If i connect to the vpn from home (on the same laptop) the vpn connects fine and I can browse the internal website without any problems.
The issue is we need the vpn and browsing to work from inside our network.
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by: PeteLongPosted on 2008-10-22 at 03:58:03ID: 22775106
Hello simplethinking,
add the following linne to the config on the cisco firewall
crypto isakmp nat-traversal 20
Regards,
PeteLong