What is the Apple iTunes server name for app artwork?

My corporate IT inserts a click through warning about downloading shareware that breaks iTunes ability to download application artwork resulting in the inability to download iTunes App updates (music is not affected). I could visit http://phobos.apple.com/ in my browser to click through the warning before opening iTunes and all was fine. Recently, it would appear that Apple has moved the location of iTunes application artwork to a new server since all App updates are broken again. If someone can identify the new server location, I can potentially click through the warning in a web browser to restore the ability of iTunes to update my Apps.

Older troubleshooting lists of iTunes servers do not include one that works for the current problem.

The presence of this intranet click-through warning window results in error code 8012 when new apps try to download automatically in iTunes on our corporate network.

I recommend Apple produce a an up-to-date list of iTunes server names that corporate IT security can whitelist.