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  1. #1

    how to Block PORT in RH9

    udp 0 0 0.0.0.0:32768 0.0.0.0:*
    udp 0 0 0.0.0.0:32769 0.0.0.0:*
    udp 0 0 0.0.0.0:32771 0.0.0.0:*
    udp 0 0 127.0.0.1:53 0.0.0.0:*
    udp 0 0 0.0.0.0:3130 0.0.0.0:*
    udp 0 0 0.0.0.0:3011 0.0.0.0:*
    udp 0 0 0.0.0.0:990 0.0.0.0:*
    udp 0 0 0.0.0.0:111 0.0.0.0:*

    tcp 0 0 0.0.0.0:32768 0.0.0.0:* LISTEN
    tcp 0 0 0.0.0.0:993 0.0.0.0:* LISTEN
    tcp 0 0 127.0.0.1:32769 0.0.0.0:* LISTEN
    tcp 0 0 0.0.0.0:3011 0.0.0.0:* LISTEN
    tcp 0 0 0.0.0.0:995 0.0.0.0:* LISTEN
    tcp 0 0 0.0.0.0:3306 0.0.0.0:* LISTEN
    tcp 0 0 0.0.0.0:106 0.0.0.0:* LISTEN
    tcp 0 0 0.0.0.0:110 0.0.0.0:* LISTEN
    tcp 0 0 0.0.0.0:143 0.0.0.0:* LISTEN
    tcp 0 0 0.0.0.0:111 0.0.0.0:* LISTEN
    tcp 0 0 0.0.0.0:80 0.0.0.0:* LISTEN
    tcp 0 0 0.0.0.0:1040 0.0.0.0:* LISTEN
    tcp 0 0 0.0.0.0:30000 0.0.0.0:* LISTEN
    tcp 0 0 0.0.0.0:465 0.0.0.0:* LISTEN
    tcp 0 0 0.0.0.0:21 0.0.0.0:* LISTEN
    tcp 0 0 127.0.0.1:53 0.0.0.0:* LISTEN
    tcp 0 0 0.0.0.0:3128 0.0.0.0:* LISTEN
    tcp 0 0 0.0.0.0:25 0.0.0.0:* LISTEN
    tcp 0 0 127.0.0.1:953 0.0.0.0:* LISTEN


    which port is not known as backdoor and how to block unknow port ? i used APF and i opened ports 21 22 25 110 443 53 8443 3011 1982 .

  2. #2
    Join Date
    Jan 2004
    Location
    Greece
    Posts
    2,123
    It's not good to close all ports because ftp uses some ports for passive transfers. Setup your ftp server to use ports 49150-49200 and leave them open from the firewall.

  3. #3
    Join Date
    Dec 2003
    Posts
    141
    Or, you could use disable passive mode so you dont need to open up so many ports...

  4. #4
    Join Date
    Feb 2004
    Posts
    772
    Hi,

    Please refer this link for the possible backdoor ports available.

    http://www.onctek.com/trojanports.html.

    Iptables(Firewall) is the best way for blocking the unknown ports.

    Regards,

    Bright
    24 / 7 Technical Support
    Bright Info Solutions

  5. #5
    how to block ports with iptables ?

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