We've started using the IP address restrictions on campus for our testing center, and so far we're really happy with the change. Some faculty are so happy with it that they've started using the custom IP restriction option to lock down exams to computers in their own department labs. The trouble is that if a student starts an exam outside of one of these department labs, they see the same generic message we have in place for the testing center restrictions which instructs them to go one of these locations. It would be nice if when you're creating a custom IP address restriction on an exam there was a way in that option to provide a custom error message as well. This way students don't end up getting confused about where they should go to take the exam or who they should contact if they have questions.