Firewall error while connecting to IBM i (Pub400.com)

Hi,

I am getting below error message( even though I have turned off all sort of fire walls at my system) when trying to connect to pub400.com (192.168.2.1)

Referring to this link to resolve this error "How to check Firewall blockage for Operations Console or HMC 5250 console (ibm.com)<https://www.ibm.com/support/pages/how-check-firewall-blockage-operations-console-or-hmc-5250-console>"

But from DOS command prompt get below error message:-
"E:\SW\IBM i Access Client Solutions\IBM i ACS>java -jar acsbundle.jar /PLUGIN=ping /SYSTEM=192.168.2.1 /PORTS=23
Verifying connection to port 23 service...Failed **** MSGCO1048 - A firewall blockage or time-out occurred trying to connect to the IBM i using port number 23
Done

E:\SW\IBM i Access Client Solutions\IBM i ACS>"

How can this error be resolved here?

Thanks.