Question

Cisco VPN Client cannot connect - Error 51

Asked by: nsdhouston

I am unable to initialize the Cisco VPN client software on a Windows XP laptop.  When I click on the shortcut to intialize the program, it returns an error which reads:

"Error 51: Unable to communicate with the VPN subsystem
Please make sure that at least one network interface is active
and has an IP address and start this application again."

I have unintalled the client software and then re-installed, I have installed a newer version of the client software, and then uninstalled and re-installed the original version of the Cisco client software, and nothing has corrected this issue.

At one point in time, the client software ran perfectly on this laptop.  Without any knowledge of any changes to the system, it just started this error message a week ago and I cannot get around it.

Please advise on this - it is a critical issue dealing with a local law enforcement agency.

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Asked On
2007-06-28 at 07:54:38ID22664315
Tags

vpn

,

error

,

51

,

cisco

,

client

Topics

Cisco PIX Firewall

,

Virtual Private Networking (VPN)

Participating Experts
4
Points
500
Comments
6

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Answers

 

by: jkittle99Posted on 2007-06-29 at 19:44:25ID: 19394672

Normally you would be right on track - more times than not, "VPN Subsystem" problems have to do with the vpn client software not properly communicating with the operating system.  Don't know if you're dealing with a "windows thing" or an environmental issue - firewall, etc.   Any software firewalls configured on the box that might be doing something weird? Any changes made to the system that you can tell us about?

 

by: nsdhoustonPosted on 2007-07-02 at 13:42:51ID: 19406785


Well, I gave up on this issue and decided to reload the laptop altogether.

I never was able to identify why the system started randomly having this problem and I experienced several other software related issues as I continued to troubleshoot the problem.

At the end of the day, it was easier to just reload the system and start from scratch.

 

by: jkittle99Posted on 2007-07-02 at 17:29:17ID: 19407879

More than likely - you made the right choice. Sometimes its easier to slick the box than waste precious time.  

 

by: capibarPosted on 2008-04-09 at 01:55:31ID: 21312924

I have more or less the same problem.
Error 51 while I start the vpn client.
I have tried: Reinstallation, upgrade, downgrade, registry clean with WinTools.net Pro, TCPSock reset.

Helps nothing...

 

by: dharnetPosted on 2009-12-31 at 15:02:14ID: 26156373

Cisco VPN Client cannot connect - Error 51 any help

 

by: HoribaITPosted on 2010-04-06 at 19:12:42ID: 29972428

If you have McAfee firewall installed remove it. this is casued by third partry firewall.
Rajah - HORIBA

20120131-EE-VQP-002

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