Airport issue?

[cjo85]

I have 2 iPhone 4's, 2 MacBook Pros, and a PC connected to my airport extreme. Not one of them can get iTunes to connect to the store. They just say loading and then say the connection timed out. The internet is working fine otherwise across all devices. They were all working fine this morning and now no luck. Any advice or tips? Oh and all the devices are up to date on their firmware. Also, I am using comcast internet. I don't think this is the problem since my father uses comcast and hasn't had any issues with his iPad