SMTP errors after moving to internal IP behind NAT firewall

ggduff · 01-11-2006, 01:37 PM

I moved a server behind a NAT firewall and started having problems with SMTP mail within my PHP scripts.

We'll say the public IP is: 24.101.202.14
And the firewall routes this IP to: 192.168.0.14

The errors I'm getting are like this:

Warning: fsockopen(): unable to connect to mydomain.com:25 in /home/mydomain/public_html/forums/includes/smtp.php on line 111

Warning: Cannot modify header information - headers already sent by (output started at /home/mydomain/public_html/forums/includes/smtp.php:111) in /home/mydomain/public_html/forums/includes/page_header.php on line 474

Warning: Cannot modify header information - headers already sent by (output started at /home/mydomain/public_html/forums/includes/smtp.php:111) in /home/mydomain/public_html/forums/includes/page_header.php on line 476

Warning: Cannot modify header information - headers already sent by (output started at /home/mydomain/public_html/forums/includes/smtp.php:111) in /home/mydomain/public_html/forums/includes/page_header.php on line 477

I'm thinking this has something to do with the headers. Could this be a configuration in Exim that I could change to fix the problem?

This is a CPanel / Red Hat Enterprise 4 server.

Thanks!

allelopath · 01-11-2006, 04:32 PM

Have you done DNS/Reverse DNS on mydomain.com <-> 192.168.0.14?

ggduff · 01-11-2006, 09:13 PM

Yes, we did put the reverse DNS entries on a server in our subnet.