Images not showing on website when accessed by IP Address

I have an internal web site hosted on a Windows server (2012 R2). When I access the site by the name "vhac" I can see all images on a certain page. However, if I go to the same page in the site using the IP address (10.10.10.10) one of the images doesn't show up.

The site is under the Default Web Site in IIS. The image is in a directory on the server that is mapped as a virtual directory for the default web site. The only binding that is setup is http, no host name, port 80, All unassigned IP addresses, which I believe is just the default.

The URL of the image is \\10.10.10.10\MIL\image.jpg

TIA