port warded (iptables) postgres

Hello

I have successfully used iptables to direct ports for other services.
For example I run apache on 8443 on 127.0.0.1 and
use iptable to direct traffic to public ip on 443. Trying the same
with postgresql does not seem to work properly.

I was wondering whether anyone has successfully used iptables +
postgres this way

Thanks in advance

Mr. Wu