Question about Port

Hello everyone

I need assistance in case you guys know this. my client needs to telnet to his server using different port like for example 12345. Typing

telnet ip 12345 does not connect or being refused by the server even I already added that new port to the firewall /etc/csf/csf.conf in the tcp_in and tcp_out.

My server provider told me that a service or apps should be listening to that port. Now my question is where do we need to tell the server that this apps should response when someone will telnet to port 123456 ?

Actually the apps is a java running on tomcat/apache on centOS.

 

 

 

 

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