OS X 10.5.1 Upgrade + Cisco VPN + ‘Error 51: Unable to communicate with the VPN subsystem’ ? Try this.
December 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 Responses to OS X 10.5.1 Upgrade + Cisco VPN + ‘Error 51: Unable to communicate with the VPN subsystem’ ? Try this.
Phil
March 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
Phil
March 5th, 2008 at 8:40 am
I upgraded my VPN client from v4.9.0 to v4.9.1 and that resolved the issue.
Tony
April 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?
Tre
June 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
Levon
September 23rd, 2008 at 8:28 am
I have the same error showing up occasionally on my group Macs running 10.4.11.