N.Korea! However if you are quick you can probably get a pic at almost any forbidden airport. Speaking of N.Korea, I believe that there are 2 pics from the ramp of Pyongyang Airport from a photog with some major balls.
As for India, well I have been there but never attempted airport photography so I can not speak to that point. However perhaps it may be due to the very tense political situation in S.Asia, namely the relations between India and Pakistan.
Many African airports definetly frown on airport photography. I know this from personal experience when I was walking from our AZ
742 (no jetway avaliable) at NBO and I turned around to take a snap of the plane that I just exited when a ramp worker put his hand in front of my lens and stated that photography was forbidden at NBO. I also had a similar problen at Addis Ababa and Lusaka. Fortunely I received friendly but firm warnings on all 3 occasions.