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In order to allow input from port 8443, I have inputed the iptables rule:

-A INPUT -i eth0 -p tcp --dport 8443 -j ACCEPT

However, when I type:

$ netstat -a

There is no reference to https or 8443. The result is:

Proto Recv-Q Send-Q Local Address           Foreign Address         State      
tcp        0      0 *:6311                  *:*                     LISTEN     
tcp        0      0 *:ssh                   *:*                     LISTEN     
tcp        0      0 gauss:ssh               ommited                 ESTABLISHED
tcp        0      0 gauss:ssh               omitted                 ESTABLISHED
tcp        0      0 localhost:6311          localhost:48872         ESTABLISHED
tcp6       0      0 localhost:8005          [::]:*                  LISTEN     
tcp6       0      0 [::]:8009               [::]:*                  LISTEN     
tcp6       0      0 [::]:www                [::]:*                  LISTEN     
tcp6       0      0 [::]:ssh                [::]:*                  LISTEN     
tcp6       0      0 localhost:48872         localhost:6311          ESTABLISHED
udp        0      0 *:mdns                  *:*                                
udp        0      0 *:52703                 *:*                                
udp6       0      0 [::]:42168              [::]:*                             
udp6       0      0 [::]:mdns               [::]:*     

How can I successfully open port 8443?

Thanks

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migrated from stackoverflow.com Dec 13 '11 at 20:37

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5  
What makes you think that you didn't open port 8443? netstat -a lists the ports on which something is listening, not the ports that are open w.r.t. the firewall. –  Rob Dec 13 '11 at 20:23
    
Ah, so if 8443 isn't appearing on netstat -a it means that Tomcat is not working with it? I mean, can I conclude that the problem is with Tomcat and not with firewall? –  jdanielnd Dec 13 '11 at 20:31
    
That is the conclusion that I would draw. –  Rob Dec 13 '11 at 20:32
    
I have changed some Tomcat configurations and now it appears on netstat -a. However I still can't ping or access 443. What else could be blocking it? –  João Daniel Dec 13 '11 at 20:52
3  
ping is not the right tool for testing a TCP port, because ping uses ICMP. –  Ben Voigt Dec 13 '11 at 21:02

1 Answer 1

iptables will only allow the port to get in, it will not "open" the port!

If you want to check what ports are allowed by iptables, you should you iptables -L -nv

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Also, since the rule is appended above, you will want to make sure that there isn't a rule with higher precedence to reject or drop it before the rule to accept is processed. –  Aaron Copley Dec 13 '11 at 20:43
    
There was a "drop all" rule before it. However, even if I change the order and let the DROP rule as the last, I can't access or ping localhost 443. –  João Daniel Dec 13 '11 at 20:50

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