help please.

Any browser, safari, firefox and opera, can not open or any related apple website.
The internet connection is fine. i can access other websites. Moreover, itunes can not access to itunes store and software update function does not download too.

There might be a solution posting on apple website but I can't access.

Perhaps, the problem is about tcp port.
Since I started using Transmission downloading lots of stuffs, the connection with apple website is out.

Thank you for ur help.