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I have two network interfaces in my CentOS 5.8 machine, one with a local IP and one with an external, publicly available, IP. I'm running SSH and some other services. I can access these if I connect to the local IP of the machine from some other machine in the same local network. But if I connect from another machine to the external, public IP of the machine, I can't get in.

Even though I disabled the IPtables firewall with service iptables stop, it won't work. Any suggestions? I have tried with SELinux disabled (setenforce 0) and also by adding ports to the setup firewall configuration. I did check with netstat and both the SSH service and other services are listening to 0.0.0.0.

  • What did you get on the client when connecting via public IP? Also post the /var/log/secure on the server. – quanta Sep 20 '12 at 4:48
  • [root@xxx ~]# ssh xxx.xxx.xxx.xxx ssh: connect to host xxx.xxx.xxx.xxx port 22: Connection timed out Nothing is added to /var/log/secure – dataviruset Sep 20 '12 at 7:24
  • netstat -nlp | grep :22? – quanta Sep 20 '12 at 7:35
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Check that the router is forwarding the inbound traffic. Additionally, verify that there are no odd rules in /etc/hosts.deny.

  • Apparently there was some hardware firewall I didn't know of, so the problem wasn't in CentOS nor IPtables. Thanks for helping! – dataviruset Sep 20 '12 at 7:35

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