CentOS

I'm newbie about IpSec L2TP and i make it with Openswan and my OS server is Centos. When I tried to establish the client ( using Windows 7) the connection Error 742 came up. How to look type of encryption for Centos and how to solve this problem?

Thank you

Since this is not a Windows forum, you'd better expand on error 742 and what it means.