OS X 10.5.1 Upgrade + Cisco VPN + ‘Error 51: Unable to communicate with the VPN subsystem’ ? Try this.

Dec 10, 2007 in citations

If you’ve recently upgraded to OS X 10.5.1 and noticed your Cisco VPN client reporting a friendly ‘Error 51: Unable to communicate with the VPN subsystem‘ error, you’ll need to do the following.

sudo /System/Library/StartupItems/CiscoVPN/CiscoVPN restart

Essentially the Cisco VPN extension just needs to be restarted.

Thanks to Anders Brownworth for this tip.

5 Replies

  1. Phil

    Mar 5th, 2008 at 7:56 am

    I upgraded to OSX 10.5.2. When I attempted to start the Cisco VPN Client I received Error 51 as above. I tried the fix (sudo command) listed above, but the issue is not resolved. Error 51 appears when I restart the VPN client. I also turned off internet sharing, but Error 51 persists. Any thoughts or ideas would be appreciated.

    Thanks

  2. Phil

    Mar 5th, 2008 at 8:40 am

    I upgraded my VPN client from v4.9.0 to v4.9.1 and that resolved the issue.

  3. Tony

    Apr 7th, 2008 at 1:49 pm

    Phil,

    How did you get 4.9.1? The Cisco site only has 4.9.01. Is it a beta version?

  4. Tre

    Jun 19th, 2008 at 7:36 pm

    I had the same error and I was using version 4.9.0 but I just installed 4.9.1 and it worked like a charm. Thanks Phil for the info

  5. Levon

    Sep 23rd, 2008 at 8:28 am

    I have the same error showing up occasionally on my group Macs running 10.4.11.

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