Unfortunately, the Cisco AnyConnect client for Mac conflicts with Pow. And by "conflicts", I mean it causes a grey-screen-of-death kernel panic anytime you connect to the VPN and Pow is installed.
As an alternative, there is OpenConnect, a command-line client for Cisco's AnyConnect SSL VPN.
Here's how to get it set up on Mac OS X:
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OpenConnect can be installed via homebrew:
brew update
brew install openconnect