To connect to Macworld's servers, I use the Cisco VPN Client (version 4.9.01). While this works well most of the time, I occasionally receive this error message when I launch the app: 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. When this occurs, I definitely have an active network interface that has an IP address, so it's quite clearly not an issue with my machine's settings. The problem seems to be related to sleeping the Mac after using the Cisco VPN Client; this sometimes (but not always) will lead to the above error message when I next try to use the VPN Client.

You can choose whether you want the firewall to allow or block the application from accessing the Internet. When an application for which you have not specified Internet access tries to connect to the Internet, Norton product prompts you with a notification dialog. Firewall help for mac. In addition to setting Internet access for applications, you can select the following options for the application in the Application Blocking window.

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What makes it extra frustrating is that it's not consistent -- the app will work for days at a time through sleep and wake cycles, then spontaneously decide it's time for error 51 to appear. I used to think rebooting was the only way to solve this problem -- I hadn't had much luck with the solutions posted in. A while back, after getting '51'd' again, I went in search of a better solution --.

In Terminal, use this relatively simple command to stop and restart the kernel extension that the Cisco VPN Client uses: sudo /System/Library/StartupItems/CiscoVPN/CiscoVPN restart In the two or three times I've had this problem occur since finding the above solution, restarting the kernel extension has fixed the problem every time. So thanks to Anders.com for solving this frustrating issue with the Cisco VPN Client. I would hope a future Cisco VPN Client update would solve the issue entirely, but that fix has been published for two years already, so I'm not holding my breath.

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Yes - this fix does work great if you're an admin user - we've been using it successfully for a few years now. We also see this error occur a lot recently when switching between network locations and/or switching AirPort networks - most of the time if you quit the VPN client, 'Turn AirPort Off' from the AirPort menu - and then turn it back on and rejoin the airport network - the Cisco VPN Client can then be relaunched and will recognize the airport network interface.

(which is the only workaround I have found for the non-admin accounts) [ ].