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Can not open Port 43?

systemn
Hello, I have a same problem with csf, i try all option to open port 43 buy still have a status close. I do all what need. Login with ssh to server, edit nano etc/csf/csf.conf Found line # Allow incoming TCP ports TCP_IN = "20,21,22,25,26,37,43,53,80,110,113,443,465,873,2087,2089,2703" # Allow outgoing TCP ports TCP_OUT = "20,21,22,25,26,37,43,53,80,110,113,443,465,873,2087,2089,2703" # Allow incoming UDP ports UDP_IN = "20,21,43,53,465,6277,24441" # Allow outgoing UDP ports UDP_OUT = "20,21,43,53,113,123,465,873,6277,24441,33434:33523" And for all 4 i add port 43 . After save change and restart service csf restart But i check again after restart i still have close port 43. Any help to do this ? Thank you,

Comments

9 comments

Date Votes
  • quizknows
    Do you actually have a service listening on the port? Are you trying to connect out on that port, or accept connections on it? It's easier to help if we know what you are trying to accomplish. Last but not least you can rule out any rogue iptables rules if you do a quick disable/re-enable of csf by running: csf -x ; csf -e
    0
  • systemn
    Do you actually have a service listening on the port?

    Yes i have whois server and other service witch using this port 43
    Are you trying to connect out on that port, or accept connections on it? It's easier to help if we know what you are trying to accomplish.

    I try all option, check port in and out with other servers buy any time i get status close
    Last but not least you can rule out any rogue iptables rules if you do a quick disable/re-enable of csf by running: csf -x ; csf -e

    I try and this to disable CSF but not work
    0
  • cPanelMichael
    Hello :) You can verify if a service is listening for connections on this port with a command such as:
    netstat -lnp | grep :43
    Also, you may want to consult with your data center or hosting provider to determine if traffic to or from this port is blocked in their own firewall. Thank you.
    0
  • systemn
    Hello :) You can verify if a service is listening for connections on this port with a command such as:
    netstat -lnp | grep :43
    Also, you may want to consult with your data center or hosting provider to determine if traffic to or from this port is blocked in their own firewall. Thank you.

    I have root server and i Managed this server. I was contacted and Data Center and get information that server not have any blocked port.
    0
  • quizknows
    What is your output of the netstat command cPanelMichael posted? I would advise checking the same, and without that it will be hard to help you further.
    0
  • systemn
    Hello, I stile have a problem with this, now when enter
    netstat -lnp | grep :43
    No status, or any other information just back to root.
    0
  • cPanelMichael
    Yes i have whois server and other service witch using this port 43

    You may want to try configuring these services to listen on a higher port number to see if that makes a difference. Also, make sure the services you are referring to are running on the system. EX:
    ps aux|grep service-name
    Thank you.
    0
  • twhiting9275
    port 43, as I mentioned on WHT isn't going to have anything running on it by default. It should be left open and unused. Your CSF configuration is fine . What happens when you try to do an nslookup from inside of your shell? You said that nslookup works fine, correct? So, what's the issue?
    0
  • quizknows
    Hello, I stile have a problem with this, now when enter
    netstat -lnp | grep :43
    No status, or any other information just back to root.

    This means that no service is bound to that port. In other words, no process is ready to accept connections on that port.
    0

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