Since upgrading to OS X Lion I can no longer use Cisco VPN Client, I keep getting the following error message:
Error 51: Unable to communicate with the VPN subsystem. Please make sure that you have at least one network interface that is currently active and has an IP address and start this application again.
Please help I need remote desk top for work.
MacBook Pro, Mac OS X (10.6.4)
Are you using the software client from Cisco, or OSX's built-in VPN? In my experience, almost every operating system upgrade has needed a update to the VPN client software. Have you checked if there's a newer Cisco client for your office?
That said, have you tried uninstalling and reinstalling the Cisco software? Also, OSX's built-in VPN client works for many Cisco implementations, so works for a lot of people. If possible, I recommend uninstalling Cisco's software an see if you can configure OSX's VPN. I'm currently using OSX's VPN to a Cisco ASA 5510 with SecureID authentication. With OSX 10.6.8 and 10.7. (And on my iPad as well. 🙂 )
Hi Asatoran
I did as you suggested I uninstalled it downloaded this version: VPN Client 4.9 for Mac from this site: http://www.helpdesk.ugent.be/vpn/en/akkoord.php
And it seems to be working perfectly now.
Thanks
Check out this link:
When going to a 64 bit OS (For me, it broke with Lion) the Cisco VPN no longer works because it is a 32 bit application.
http://jmilbery.wordpress.com/2011/07/26/cisco-vpn-with-macos-lion/
The native OS VPN works fine for me connecting to an ASA. Conencting to a VPN 3k concentrator can have mixed results, because they haven't updated those things in a while, and they will be end of support from Cisco next year.
The OS VPN can be configured in your network properties, and you get to stay in 64 bit mode.
Cisco VPN Client Error 51 message since upgrade to Lion
