Cannot hit iTUNES store behind corporate Firewall

Up until 9/28, I had no problems hitting the iTunes store to update or restore devices. On or about 9/28, my connection fails. Like most network folks, "they didn't change anything". 😠 They said APPLE must have moved or changed something.

I am currently running the iTunes 12.3.0.44. One of my co-workers doesn't have an issue but he is on a much earlier version of iTunes and his still works.

To satisfy my network guys, can you confirm nothing has changed on Apple's side or any changes with the application?