Cannot Load the iTones Store page from iTones and collect apps Update

Question

My iTune account and credit card am belonging to Hong Kong, but often travel to different countries. I have recently purchased iPhone and MacBook Pro, and also purchased some apps when I was staying in Hong Kong.
This week I visit Singapore and noticed that there are two purchased apps has update. When I click "Update All", it said it was disallowed for my account to download apps in Singapore.
After studying a lot of discussion thread, I think I neglected an important legal term that I cannot purchase or rental apps outside Hong Kong.
However, here I am not trying to access Singapore iTunes apps store, but only visit Hong Kong iTunes apps store. Would there be any possible way for me to only visit Hong Kong iTunes apps store and purchase or collecting apps update?
Right now, I even cannot use iTunes to access iTunes apps store home page. The loading of the iTunes apps store page would stop in the middle. Perhaps iTunes would really check my own public ip address. I connect to internet through Singapore local carrier 3G data access.
Now, many people in the world would travel or even move between countries frequently. Most of Apple fans are willing to spend money on valuable apps, songs or movies. It is pretty ridiculous for blocking us accessing other countries' iTunes store. Even it is copy right issues, at least it should allow me to access my own country iTunes apps store, when I am physically staying at oversea.
Please help suggest me any kind of solution for my situation.

Answer 1

After a month and I am back to Hong Kong, I called to local AppleCare for assistance. Finally my problem has to be fixed by resetting iTunes preference. Here below is the procedure:
0. Quit iTunes application
1. Click the Finder icon in the Dock.
2. Choose Go to Folder from the Go menu.
3. Type /Library/Preferences
4. Click Go.
5. In the Finder window, locate the file named com.apple.iTunes.*
6. Drag all those com.apple.iTunes.* files to desktop or trash
7. Open iTunes application
8. Follow the instruction to setup the iTunes again by clicking Yes
9. After loading all your original audio files, click to iTunes store and try Sign In
With above procedures, now I can access to iTunes and sign in with my account.
AppleCare also said this is part of regular iTunes troubleshooting procedure. She guided me to open a new testing user account in my Mac and open iTunes there. I found that I can access to iTunes Store and sign in with my account. Therefore, it means the iTunes access issue is not because of my computer internet connection issue, but related to my own Mac account iTunes preference setting. That's why she guided me with above procedure to reset iTunes preference.
She said there is a lot of solution about (-50) error documented in "http://support.apple.com/kb/TS3288".
I appreciate very much for this AppleCare technical support. She is so nice and patient for giving me instruction step by step. However, I forgot what her name is. She is worth for being praised.