Iptables You cannot access a Web site after you add port 80

Server is attacked,

The attack situation is as follows, constantly trying to crack the password:

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Previous environment:

IP logons are restricted only through hosts.allow and Hosts.deny, but these problems still occur.

Environment:

Server service: Devicot postfix nginx Tomcat

Processing method: The extranet can only access 80 ports and cannot access other ports.

Execution method:

Http://www.cnblogs.com/JemBai/archive/2009/03/19/1416364.html