Make sure that the project to which you’re trying to connect is shared. If the project creator chose to keep the project private, you won’t be able to access it.

Make sure that the Version Cue Server that hosts the project is configured to be visible to other users (see Set Version Cue Server preferences).

If you’re using Acrobat 8 or a Version Cue-enabled Adobe Creative Suite 2 component to access the project, make sure the creator of the project specified that it be compatible with CS2. Otherwise, you won’t be able to see the project on the Version Cue CS3 Server.