I am rather new to Linux and trying to set up a MailScanner box. I went as far as to set it up with postfix and succeeded sending a test message via it from the local console.
However, when I try to connect to port 25 on the box IP which is 192.168.2.9, I get connection refused message. Running nmap localhost shows open port 25, however nmap 192.168.2.9 shows no open port 25. IPtables and selinux are disabled.
How can I determine what is blocking the port and how do I unblock it?