How to fix ipad error -1004 "could not connect to the server"

I am trying to access the tablet edition of Vanity Fair. I already have a subscription and when I click on the "Tap here for acces to the tablet edition" it takes me to a screen & this error message pops up:

Cannot Open Page

This page cannot be opended because of an error

This error is "Could not connect to the server."(-1004).

I have deleted, reinstalled via itunes on my mac, done a hard restart and nothing seems to be working. I can browse the web using safari and am connected to the internet via wifi.

Any suggestions?