Site Access

When i try to access my site i get this: The connection has timed out. I can reach the site using a proxy, but i can’t perform certain functions and it’s sloowwww. Could there be something on my computer keeping me from the site, because i can get the site on other computers?
Here is the site link: http://myiphonesource.hostzi.com. I’ve contacted my host provider and they tell me there is a problem with my script coding (it’s not related to hosting servers). I’m a bit of a newbie, so what does this mean?