network manager can not save imported openvpn configuration

[Tim Richardson]

This is 14.04 32 bit intel.

I have installed OpenVPN access server on another machine. It is configured with username and password security.
By logging in to it, a configuration file can be downloaded.

I want to set up a VPN network connection for this.
So I go to the connections manager, choose to create a new VPN connection by importing a config file.
The config file imports.
But the the save button is disabled. A tooltip over the button asks me to authenticate, but there is no authentication dialog.
A save button is often disabled if there is a required field missing. However, I need to choose password authentication which only requires a username (and a password).

So all the fields I need are completed. But I can not save.