If your Vibe server is configured with Integrated Windows Authentication, Vibe Desktop cannot synchronize files on your Vibe site because of a port conflict.
To work around this issue:
Configure Vibe Desktop and the Vibe Add-in to point directly to Tomcat’s secure port (by bypassing port 80 and port 443) in the Vibe Desktop and Vibe Add-in installation programs.
For more information about configuring Windows Authentication for your Vibe site, see Configuring Single Sign-On with Internet Information Services for Windows
in the Novell Vibe 3.4 Installation Guide.