Comment 2 for bug 1197313

I suppose no.

To send empty domain name during authentication vpnc should be started with --domain "" command line option or Domain option without a value in config file. When starting connection, network-manager-vpnc makes temporary config file using connection parameters from NetworkManager and starts vpnc with it. The problem arises, because NetworkManager does not store domain if it is empty (AFAIK it cannot store empty strings at all).

So you have to either start vpnc manually, or somehow patch network-manager-vpnc to include empty Domain option.

If you need I can publish patched network-manager-vpnc version 0.9.8 that always sends domain. It's not a proper fix for the issue, but works as a temporary solution for me.