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  1. #1

    port 25 problems

    Hello All,

    Redhat 9 box running apache, postfix, few other things. When I nmap my local box, I am told:

    Port State Service
    22/tcp open ssh
    25/tcp open smtp
    80/tcp open http
    111/tcp open sunrpc
    631/tcp open ipp
    6000/tcp open X11
    8080/tcp open http-proxy
    10000/tcp open snet-sensor-mgmt

    When I nmap my domain from outside my lan I get:

    20/tcp closed ftp-data
    21/tcp closed ftp
    25/tcp closed smtp
    80/tcp open http
    81/tcp open hosts2-ns
    110/tcp closed pop-3
    113/tcp closed auth
    232/tcp open unknown
    252/tcp closed unknown
    3389/tcp open ms-term-serv
    5901/tcp closed vnc-1
    8080/tcp open http-proxy

    Why do 21, 25 110 all show up as closed from the outside. I have verified that my ISP (RoadRunner) does not block 25. I cant figure this out. Even iptabes looks clean:

    Chain INPUT (policy ACCEPT)
    target prot opt source destination

    Chain FORWARD (policy ACCEPT)
    target prot opt source destination

    Chain OUTPUT (policy ACCEPT)
    target prot opt source destination

    Any help you guys can offer would be GREATLY appreciated. I am running out of hair.


    -=Mike M

  2. #2
    Linux Engineer
    Join Date
    Sep 2003
    Knoxhell, TN
    are you behind a hardware router that may be blocking the ports?
    Their code will be beautiful, even if their desks are buried in 3 feet of crap. - esr

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