To access the theses images from anywhere other than Purdue, you need a VPN connection. The following is from the ITAP security guidelines page. http://www.itap.purdue.edu/security/policies/PortRestrictionFAQ.cfm

VPN

Q) What does the VPN do for me, and what is a VPN?
A) The VPN allows you to receive a Purdue IP address and act as an on-campus host. This allows access past port restrictions and other security measures, and allows your system to easily interoperate with on-campus services that may not work for off-campus systems.

Q) How do I set up my system to use the VPN? Is it hard?
A) For most common systems, VPN set up is fairly easy. See  http://www.itap.purdue.edu/connections/vpn/ for details.

Q) I live outside of town, or need to access Purdue resources from a remote site. Does this apply to me, and will the VPN work?
A) The VPN is accessible from anywhere in the world with proper Purdue credentials (Purdue career account).