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Cisco VPN and Lion - Error 51

Prior to upgrading to Lion there were no issues using Cisco's VPN Client (4.9.01). With Lion, Error 51 is being returned stating it is unable to communication with the subsystem.


Is there a known workaround for this?


Thank you!

Mac mini, Mac OS X (10.6.8)

Posted on Jul 21, 2011 9:17 AM

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Posted on Jul 21, 2011 4:30 PM

I had the same issue. Someone suggested I hold down the 2 and 3 keys when I restart so that the system will revert back to 32 bit (whatever that means). It worked after I did that. I just need to remember to hold it down whenever I turn the computer on. Or else, I'll have to restart to access the VPN.


I'm not sure what gets affected when you do this though. But, I seem to be able to carry on very well.

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Jul 21, 2011 4:30 PM in response to lgldsr712

I had the same issue. Someone suggested I hold down the 2 and 3 keys when I restart so that the system will revert back to 32 bit (whatever that means). It worked after I did that. I just need to remember to hold it down whenever I turn the computer on. Or else, I'll have to restart to access the VPN.


I'm not sure what gets affected when you do this though. But, I seem to be able to carry on very well.

Jul 30, 2011 1:44 PM in response to lgldsr712

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 and Lion - Error 51

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