Today my site hosted in hostgator went down.
Checked with a host-tracker and seems to be reachable from all over the world,
asked other folk in my country to check and he see it ok.

My site hosted there and the hostgator site itself are down to me but other people
can access it.

Same thing happen with a client site (not hosted there) I visited that site yesterday ok,
but can't access it today. I can access certain websites like google and others.

What is going wrong? Is it a dns problem? Must I repair tcp ip?

I checked my hosted site and ftp doesn't work. That far I thought was a normal "down"
from my hosting but others can see my site...