VPN on Mac OS X (10.4 - Tiger, 10.5 - Leopard, 10.6 - Snow Leopard)

Connect via OS X Network Interface

Looking on google all I could fins was Mac os fixes for this error, and thats not good. Personal firewalls, or the Microsoft ipsec client are common problems there. Also try the standard troubleshooting spyware, registry cleaning , an dsee if that helps check your application event log, see if it is throwing any other errors, this may help too. Also get Nmap or something like that to see if the port is open. The cisco client install should disable the ms ipsec services.

The 2 digit errors the cisco client throw to the user are damn near worthless.

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You want to crank up all the logging within the client, and see if you get anything more in depth. Benjamin Roberts Benjamin Roberts 26 1 1 bronze badge. I ended up giving up on the client and using Apple Network Pref ability to setup a vpn. This is good troubleshooting advice. The solution: hold 3 and 2 simultaneously during startup to boot using the bit kernel link to Apple support article. Siim K Siim K 6, 6 6 gold badges 41 41 silver badges 66 66 bronze badges.

How to Fix Cisco VPN Client Error 51 – Unable to Communicate with the VPN Subsystem

Kirk Kirk 2, 13 13 silver badges 19 19 bronze badges. What versions do you have?


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Cisco VPN Client Error 51 - Open Your Firewall - Domain Web Center

Email Required, but never shown. Featured on Meta. This trick bellow applies to Windows own built-in VPN software. If you did, move them back to resolve the issue. Idea — Reduce Noise, Save on Electricity My electric company installed an electricity consumption gadget, and ability to monitor usage online.


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