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Forum Discussion

themyth_317517's avatar
themyth_317517
Icon for Nimbostratus rankNimbostratus
May 19, 2017

Port 1720 open on F5 public virtual server

Hi guy, My virtual server pulib to Internet via F5 and just open port http/80, https/443, but when i try to telnet port 1720 to Public IP of virtual server, it connect [telnet IP 1720], its working, ...
ASM Advanced WAF
security
Pedro_Haoa's avatar
Pedro_Haoa
Ret. Employee
May 19, 2017

Hi,

 

Which TMOS version do you have? Could you post your Virtual Servers configuration?

 

Just for curiosity I did the test in different versions of TMOS without this abnormal behavior in BIG-IP.

 

This is the behavior in my lab:

 

telnet f5labs.test.lab 1720

 

Connecting To f5labs.test.lab...Could not open connection to the host, on port 1720: Connect failed

 

nmap -sT -p 1720 f5labs.test.lab

 

Starting Nmap ... Nmap scan report for f5labs.test.lab ... Host is up.

 

PORT STATE SERVICE

 

1720/tcp filtered h323q931