I bolck my self using

/sbin/iptables -A INPUT -s xxxxxxxxxx -j DROP


xxxxxxxx my IP


how can I unblock it ??

Call you Datacenter to flush the IP tables, than login and unblock yourself.

There is a leason here. When dealing with iptables , set up the cron job that will do
iptables -F every 5 minutes, That way when you screw up, and you will, chaines get cleaned and you get to log in again.

I have brother in another country

can you please give me the command so I can give him and unblock it

with out Datacenter help

iptables -F

Should flush the iptables rules. Be sure to implement the rules you want again after you log in, as this will flush *all* of your rules.

If your default policy is set to DROP, then iptables -F alone won't help you. You will also need:
iptables -P INPUT ACCEPT
iptables -P OUTPUT ACCEPT