Internet Search not working in RefMan Network 11

I’m trying to search PubMed: MEDLINE using the Internet search within RefMan 11.  After searching for a broad term, like “Cancer”, it comes up with the message “No documents retrieved fro the specified search.”  The Status Message Log contains the following information:

PubMed: Connecting to http://eutils.ncbi.nlm.nih.gov:80
PubMed: Initializing…
PubMed: No record matches.
PubMed: Closing…

I have internet access using Microsoft IE so am not sure what else to do.

Any suggestions?