Cisco VPN client and Error 51
You may come across an "Error 51" dialog when launching the Cisco VPN client. If you see this error, click the "Okay" button in the dialog box, and then quit and restart the VPN client software. The error should not appear the second time you launch the VPN client application. If you still see this error after quitting and relaunching the VPN client, please contact us through the ITS HelpDesk.
We have noted this error on Mac OS X Tiger-based computers with the Cisco VPN client version 4.6.
Note: This error should no longer appear with version 4.9 and later of the Cisco VPN client. Please obtain the latest version from the RIT Virtual Private Network pages.