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postfix/smtp connection refused

From: Peter Heybrock (heybrock_petehotmail.com)
Date: Tue Jan 01 2008 - 16:11:24 CST

Hi,
 
I have just upgraded the OS on my home server from fedora 2 to fedora 8. I have also upgraded from postfix 2.1.5 to 2.4.5.
 
I have kept most of the postfix config unchanged but although I can successfully run 'telnet localhost 25', I cannot run 'telnet <posfix host> 25' from any other machine in my network. I get 'could not open the connection to the host, on port 25: Connect failed' message on the client. There are no error messages in the server logs: maillog/messages/secure etc.
 
Here is what I have checked:
- I think have eliminated the possibility of firewall issues on both the client and the server end as I can telnet to other ports and I see nothing in log files and I can telnet on port 25 to an old test postfix server I have running on another host. There is nothing reported in the firewall logs.
- I have tried adding the -v flag to the postfix inet smtpd in master.cf but only get logging when connecting from localhost i.e. I'm pretty sure that smtpd is never successfully starting when trying to connect remotely
- I have switched SELinux to permissive mode - no difference
- The only difference that I can see is that the entries in the /etc/pam.d/smtp.postfix file has changed but even if I revert to the old settings, it makes no difference.
- After making changes, I have restarted services and even rebooted the server
 
Can anyone please offer any suggestions as to what else I can check and/or how I can get more information from the /usr/libexec/postfix/master process as to why it won't start smtpd?
 
Thanks
 
P.S. I am not a Linux/network expert so I've held off from the suggestions to run tcpdump, truss or gdb
 
 
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