Since Notes searches for new servers using the ports in alphabetical order, it will try LAN0 first if it's enabled. This causes the Notes Client to hang until you run the Terminate Windows apps command.
I had not noticed this before since I usually clean up the ports settings when I install and I have connection docs to all servers.
I was opening a database that was not local any more and the Search for database dialog came up. I mis-keyed the server name and found the clien was hung. In the status bar you could see "Searching for ocal on LAN0"
make sure you have only the TCPIP Port enabled !!