Have an odd scenario where a public website pulls some images from another server via port 81. When our staff use the site they fail to get most images, but everything else loads correctly. I have tried unloading filters and it has no affect.

NW6.5 sp6 BM3.8 sp5_IR1

Those behind BM boxes are encouraged to try... Enter "wheel" in the search field and press "go". (none of these images appear for us)
Historic Artifacts and Library Documents

First in the results list is "Great Wheel", the image URL is:

This site works fine outside of our building.

Any insight to this is appreciated.