Why did this update break my ability to connect to a Cisco VPN

I am using a native Cisco IPSec VPN connection on my MacBook Pro (Retina, 15-inch, Mid 2014) running El Capitan 10.11.4 (15E65). After this most recent software update I am no longer able to connect to the VPN. I receive the message "The VPN server did not respond. Verify the server address and try reconnecting." I have confirmed that I can successfully ping the server. My computer's firewall is off. I have entered a Server Address, Account Name, Password, and Shared Secret.

Why did this update break my Cisco VPN connection?

Any help is appreciated, thanks!