Cisco VPN issue with OS X Mavericks

If you are having an issue with the Cisco VPN client after upgrading to OS X Mavericks, here is the solution…

open a terminal

edit the sysctl.conf file

sudo vim /etc/sysctl.conf

comment out the following line.

kern.ipc.maxsuckbuf=512000.

Your file should look like this after you edit…

#
# Tuning network for broadband
#
# START
# kern.ipc.maxsockbuf=512000
net.inet.tcp.sendspace=131072
net.inet.tcp.recvspace=358400
# END

Last step is to reboot

Cisco VPN issue with OS X Mavericks – solved