Error#2038

I'm trying to open one of the sample books.

I click on it and Digital Editions opens and says it downloading.

However after about 5-10 minutes the following error message appears...

IO ERROR on NETWORK REQUEST.

Please check your network connections and try again.

Network path

http://divpi.adobe.com/bookbytes/ebx_isbn_0345472160.pdf

Event detail
ERROR#2038

Can anybody advise please