Cisco VPN Client destroyed my network connection, need help...

[coccolino]

Hello everyone,

I've been trying to figure out this one on my own for quite some time now, but I just have only very little experience with networks.

I installed the Cisco VPN Client 5.0.04.0300-k9 on my Lenovo Thinkpad T60p machine with Win XP Professional SP2. And since then I am not able to connect to my network using either my LAN or Wireless LAN network adapters. I uninstalled the vpn client, this didn't change things at all. Both adapters are no longer able to aquire an IP from the router (limited or no connectivity, ipconfig /renew not working as well), although DHCP is enabled for both adapters and the router's DHCP is working fine - I have no problems connecting using my other laptop. After uninstalling the client I tried the Winsock XP Fix, but without any success.

I also have AT&T Global Network Client installed (but not running) on the same machine, could this be the source of the problem?

Any help would be much appreciated...

Kind regards,
Kalina

 

[takev]

What is the information when you type ipconfig /all in command? Can you post the output?

 

[coccolino]

Hello Takev and thanks for your reply!

Today I took the laptop to a friend of mine. We tried different things like rolling back the whole system to the state before I installed the VPN client, repairing the registry, reinstalling the adapters, tweeking the tcp/ip configuration for the network connections, nothing seemed to help. Then he stopped the firewall (part of the standard installation for the company I work for) and it suddenly worked. We still don't know where exactly the problem was and what the Cisco VPN client did, because this firewall never caused any troubles before. And to be honest I am reluctant to use this client again :-(

 

[takev]

It happens when your security suit or firewall detects a new network or a change in the network settings. You should set the new connection as trusted or equivalent in order to be unblocked. However I am glad you solved your problem

 

[coccolino]

Thanks, then I might give it another try ... I didn't think of it because I hadn't actually run the VPN client even once, and the firewall didn't say anything, or asked of permission (which it normally does in similar situations)

 

[burtsbees]

You usually MUST open ports for a VPN (IPSec can use tcp or udp 10000, for example).
The Cisco VPN Client also has an option to turn on/off it's built-in Stateful Firewall (like CBAC, if you know anything about Cisco).

Burt