Problem installing Cisco VPN 5.0 on XP SP2

Posted on 2007-11-15
Last Modified: 2009-03-14
I'm trying to load Cisco VPN 5.0 onto an XP SP2 laptop and can't get the installer to start. I execute c:\ciscovpn_5.0\vpnclient_setup.exe and get the security warnings and then nothing more happens. The program is looking for c:\ciscovpn_5.0\installservice.exe which also gives the security warning but nothing else. The installer is finding an error but flashes by so fast I can't see any messages. Any help with either likely reasons for the errors or how to stop the installer and see the messages would be appreciated.
Question by:roviello
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LVL 11

Expert Comment

ID: 20295824
Do you have any other VPN clients installed, such as Nortel or similar?

Author Comment

ID: 20297578
Yes, I have Nortel installed have not problem using it. Unfortunately I can't get to the site with it. I also tried the Windows VPN with the same results.
LVL 11

Accepted Solution

tvman_od earned 250 total points
ID: 20298057
That's the problem. Nortel and Cisco are NOT compatible and CANNOT coexist in the same system. I stepped on it few times. The problem is how this products create IPSEC tunnel. Cisco creates virtual interfaces, Nortel applies filters fo existing interfaces. Besides that Nortel disable windows IPSEC service and Cisco requires it. There is a way to make it work on the same system, but it requires to enable/disable multiple options and restarting the system before you switch between VPNs. Mistake will cost you a painfull recovery or system reinstallation. So, as a bottom line, uninstall Nortel VPN, restart the system and then try to install Cisco product.

Author Comment

ID: 20298893
I uninstalled Nortel but there was no change. I still can't get the installer to function. I did see a registry entry for the setup program but no other indications that a install was attempted.
LVL 11

Expert Comment

ID: 20299002
There is a chance that damage has been taken. Looks like it's already screwed up. Recovery process is not trivial and there is no step by step instrucrions. General idea is to reset network stack including all the interfaces and let windows rediscover network adaptors and reinstall it correctly. Besides that native IPSEC engine could be damaged. I'm sorry...

I'll try to find instructions how to reinstall network without editing registry.

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