José David Bravo Álvarez wrote:
> Im using CentOS 5 with exim 4.63.
>
> I can do telnet localhost 25 and it works fine. But if I do telnet
> xxx.xxx.xxx.xxx 25 from Internet it refuse the conection. The server
> have not firewalls.
>
> Thanks
>
Be default many OS installs setup iptables to block pretty much every
port. Check your /etc/sysconfig/iptables file. On Fedora I had to add
an entry for smtp, http, dns, etc... of a form similar to:
-A RH-Firewall-1-INPUT -p tcp -m tcp --dport 25 -j ACCEPT
For udp protocols like DNS, be sure to add a udp rule also.
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