iOS app deployment and distribution critical network requirement

The following urls should be accessible on device and these shouldn't get blocked any time

Site:
http://ax.init.itunes.apple.com/

Purpose:
The device obtains the current file-size limit for downloading apps over the cellular network. If this site it not reachable, installation may fail

Site:
http://ocsp.apple.com/

Purpose:
The device contacts this site to check the status of the distribution certificate used to sign the provisioning profile