server 4 http service seems to be temporarily down. We will wait for Bonding.
Think all servers are working fine now. (see my signature), but still can't able to access the subdomain you mentioned here.
Go to your account page and see the column Hosted shows "Yes"
PM to some mod-account creator (active one ) and ask for help. I think this is the faster way. By the way did you change something in domain setting in Direct Admin?
I'm sorry for the delay in responding. It seems like you have renamed your (sub)domain to http://davidvuong.frihost.org/ . You can find it in DirectAdmin , which you can always access at http://126.96.36.199:2222/ (the link with the ip address) considering the other links only work when the domain still exists.