The Linux firewall has released the ports, but still cannot access the

Our firewall default rules are as follows:

If the firewall releases the port but still cannot access it, it may be because the rule is added with the IPTABLES-A option, so that the added rule is arranged after the 6th rule, although the service Iptables status shows that the port is released, but in fact, As a result of rule sixth, the new addition does not work.

Instead, use iptables-i to insert the rule, and before you add the rule 6th, you are ready to take effect.

The Linux firewall has released the ports, but still cannot access the