Cannot Use Port 43?

Mel Voss

• May 08, 2018 13:17

Port 43 opened via cfs - configuration firewall but still blocked. I can see it's listed in TCP incoming and out going but cannot access it? any help is greatly appreciated.

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  cPanelLauren

  • May 08, 2018 18:55

  Hello, You may want to ensure that any hardware appliances connected to your server have it open as well as ensure that your provider allows this port. What are you using port 43 for, if it's ok if I ask? Thanks!

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  Mel Voss

  • May 08, 2018 19:12

  Hello, You may want to ensure that any hardware appliances connected to your server have it open as well as ensure that your provider allows this port. What are you using port 43 for, if it's ok if I ask? Thanks!

  
  Sure, it's for WHO IS which used the post 43. It's a self managed server and no restrictions. I was able to open other ports except this.

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  Mel Voss

  • May 08, 2018 19:20

  Sure, it's for WHO IS which used the post 43. It's a self managed server and no restrictions. I was able to open other ports except this.

  
  I just asked the provider if they have port 43 blocked. Will report back once I get an answer.

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  cPanelLauren

  • May 08, 2018 19:28

  Hi @Mel Voss That's a good plan, how are you checking if the port is open or closed? Thanks!

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  Mel Voss

  • May 08, 2018 20:02

  I went directly in firewall settings and the port was listed. Is that correct Also, software that I am trying to install says WHOIS PORT - 43 unavailable

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  cPanelLauren

  • May 08, 2018 20:11

  Hi @Mel Voss You can also check with nmap on the server and remotely to determine if it's open - the following gives you the status for both UDP and TCP: nmap -sU -sT -p 43
  Does the program specifically require UDP or TCP? It may be that you've opened it for TCP but not UDP - whois listens on a TCP port typically though.

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  Mel Voss

  • May 08, 2018 20:20

  Hi @Mel Voss You can also check with nmap on the server and remotely to determine if it's open - the following gives you the status for both UDP and TCP: nmap -sU -sT -p 43
  Does the program specifically require UDP or TCP? It may be that you've opened it for TCP but not UDP - whois listens on a TCP port typically though.

  
  result : PORT STATE SERVICE 43/tcp filtered whois 43/udp open|filtered whois oh, and the program only needs TCP

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  Mel Voss

  • May 09, 2018 08:30

  got a confirmation that no ports are blocked by the provider. Still a bit confused why I cannot open the port?

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  cPanelLauren

  • May 09, 2018 11:57

  Hi @Mel Voss That nmap scan does indicate that TCP port 43 is filtered meaning that something is blocking it. If you've opened the port via CSF the block must be coming from somewhere else. I would suggest contacting your provider, showing them the nmap scan and requesting they assist you with identifying where the block is occurring. Thanks!

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