Hi Karen, If I may...
Your hosting provider may also lock our update server because it's outside your country. Asian countries are often associated with spam, so as a precaution some hosting companies block traffic from these areas.
Most users that I know, don't have such a problem, but for sure we don't block connections for legal users, like you are.
If you have different hosting account (different company) you can check there if you can update or not.
but as Ariba said, it can be also your Firewall (Joomla extension, htaccess or inside Hosting).