Every listen socket in the Sun Java System Web Server 6.0 has at least one connection group associated with it. When you created a listen socket, a connection group was also created, which contained the default virtual server you specified for the listen socket.
In Sun Java System Web Server 6.1, the connection group functionality is dropped. The virtual server is now directly bound to a listen socket. During migration, each connection group is migrated to an LS (listen socket) element. Each LS element contains attributes derived from both the connection group’s and the listen socket’s attributes.