I just set up OpenVPN and the network manager plugin. I purchased VPN service from PrivateInternetAccess.com. It works fine but only when the Cipher and HMAC Authentication under the advanced settings are set to "default". When I run this VPN service on Mac and Windows I am able to adjust these settings. But in Ubuntu 13.04 any setting changes from "default" results in a connection failure.
What are these "default" settings for the Cipher and HMAC?
Why can't I change them?