if I put accept all 0.0.0.0/0 means this server is totally open for any ip?
Solution 1:
is this means allow all ip from all port?
Not necessarily. Add '-v' option(iptables -nv -L) to show all/out interface.
4060K 498M ACCEPT all -- lo * 0.0.0.0/0 0.0.0.0/0
Solution 2:
If you don't want IPtables why don't you disable them.
iptables -F should do the trick
Else provide more details like the port and IP you are trying to connect to and your IP