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CiscoVPN Client: Error 51
Error Message
Error 51: Unable to communicate with the VPN subsystem. Please make sure that you have a least one network interface that is currently active and has an IP address and start that application again.
Explanation
Conflict with networking over FireWire if Paralles Desktop is installed.
Solution
Change /System/Library/StartupItems/CiscoVPN/CiscoVPN so that the start sequence looks like this:
StartService ()
{
#disable fw0
/sbin/ifconfig fw0 down
if [ -d $CISCO_VPN_DIR ]; then
ConsoleMessage "Starting Cisco Systems VPN Driver"
kextload $CISCO_VPN_DIR
fi
}
restart computer or
sudo /System/Library/StartupItems/CiscoVPN/CiscoVPN restart
Source
Fixing Cisco VPN Client 4.9 With Parallels Desktop 3.0 on Mac OS X
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