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

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nano etc/csf/csf.conf

Found line

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# Allow incoming TCP ports
TCP_IN =  "20,21,22,25,26,37,43,53,80,110,113,443,465,873,2087,2089,2703"

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# Allow outgoing TCP ports
TCP_OUT = "20,21,22,25,26,37,43,53,80,110,113,443,465,873,2087,2089,2703"

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# Allow incoming UDP ports
UDP_IN = "20,21,43,53,465,6277,24441"

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# 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

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 service csf restart

But i check again after restart i still have close port 43.

Any help to do this ?

Thank you,

[eye01]

Hello
I have the same problem.
Could you fix it?
Thank you very much for your help

[wsmith0555]

try hping3 to know where port 43 is blocked.

# check for port TCP 43 ; Use Ctrl+z to increase hop. When port connected you would receive SA/R tcp flag reply
# hping3 -T -S -p 43 <destination_ip>


# check of UDP 43 ; Use Ctrl+z to increase hop.
# hping3 -2 -T -p 43 <destination_ip>


The trace will stop at the point where the port is blocked, and Ctrl+z will not show any result.