One site does not load on iPad/iPhone when only few port like 80, 443 and 53 are allowed

Hi All,
I have a router which does port blocking allows access through certain ports only. The allowed port list include 80,8080,443 and 53 however I cannot seem to be able to connect to www.argos.co.uk using safari on iPad and iPhone. Both runs iOs 8.3. Access to other sites works without any problem.
Access to www.argos.co.uk site works fine when accessed through Android or Windows devices through the same router. Any idea what could be the problem ?

I can replicate this problem on a number of other sites!
If I lock the router to just use the main ports like 80, 8080, 443 & 53 and use an Apple device to view www.diy.com or www.boots.com the sites take 10 times longer to load than when the router has all its ports open.  I have tried a MacBook, iPad and iPhone with Safari and another browser.
If I do the same tests using Microsoft or Android devices the sites load quickly with the routers ports locked on unlocked.
Does this suggest that Apple are relying on non essential ports for web traffic?

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