In looking at those messages, it appears you are getting a connection and getting authenticated with SSH, but the remote host is not starting the session shell properly. Confirm all the settings with the remote host admin and have them check to make sure their server is up an responding (and allowing logins to start correctly). It could also be a permissions issue on the remote host if you don't have the appropriate permisions to the login directory, you might not be able to get in to the site even though you can authenticate properly.