The format for the WebDAV URL has changed in 11g. It is now
If you are using OHS in front of UCM it will be
and you will have to add _dav location to themod_wl_ohs.conf file
P.S. If you are creating a connection from the Desktop Integration Suite to WebCenter Content make sure to include the / at the end of the URL. I left it off by mistake and it would not connect.