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RE: External connection to Postfix problem

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  • Gary Brinker
    ... The output from the internal address is the 250 greeting banner and using the external IP is could not open connection : connection failed Gary
    Message 1 of 5 , Jun 20 7:55 AM

       

      > Report the output from "telnet postfix-ip-address 25" from a
      > different machine on your local network.
      >
      > Wietse
       

      The output from the internal address is the 250 greeting banner and using the external IP is
      could not open connection : connection failed
       
      Gary
    • Wietse Venema
      ... This confirms that Postfix accepts network connections, and that the problem is outside of Postfix. It could be any of: - Incorrect default route
      Message 2 of 5 , Jun 20 8:10 AM
        Wietse:
        > Report the output from "telnet postfix-ip-address 25" from a
        > different machine on your local network.

        Gary Brinker:
        > The output from the internal address is the 250 greeting banner
        > and using the external IP is could not open connection : connection
        > failed Gary

        This confirms that Postfix accepts network connections, and
        that the problem is outside of Postfix.

        It could be any of:
        - Incorrect default route configured on the Postfix host
        - Incorrect firewall configuration on the Postfix host
        - Incorrect LAN router configuration (NAT/forwarding)
        - Conflict with ISP-side configuration
        - ....

        This is a matter of systematic trouble shooting, or random experiments
        and dumb luck.

        Wietse
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