On 06/20/2013 06:23 PM, Gary Brinker wrote: > Hello, I'm new to this group but was prompted to try your thoughts on > the following message I posted to the Postfix user group, where they > suggested it was not a postfix issue and I should try here. I'm not a > Linux expert but believe I have all firewall filters off. Thanks for any > suggestions. > Gary > > Because of a hardware failure on an old installation of a postfix > gateway I took the opportunity to install an up to date version on an > Ubuntu server. I am not too far into the configuration but am having a > basic problem with accessing it from external sites. I think I can > eliminate the usual DNS and router configurations as it did work > correctly with the old system. > The issue is that I can telnet into it internally with no problem but > cannot reach it externally. I hooked up wireshark and if I'm > interpreting it correctly I do find the initial SYN come in but no > connection is established. My reading suggests that I may have an > ownership or permissions problem, but I'm not finding success in > isolating the issue. > Can anyone point out specifically what I should be looking at to > diagnose and correct this so I can get on to the meat of the configuration.
I would check some basics first. Is postfix listening on the external IP address? If not, see inet_interfaces in main.cf (man 5 postconf) sudo netstat -nlp |grep master |grep tcp Is the firewall really off? Try this: iptables -I INPUT 1 -p tcp --dport 25 -j ACCEPT This should accept connections to the SMTP port from anywhere. -- Imre Gergely http://havaz.net gpg --keyserver subkeys.pgp.net --recv-keys 0x34525305 -- ubuntu-server mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-server More info: https://wiki.ubuntu.com/ServerTeam
