@dardeer
please be accurate if you mean one of the following
Remote Operation :
This task controls whether the HMC can be operated using a Web browser from
a remote workstation.
If you are planning to connect from the same site or over VPN or even give HMC a route-able IP address ( Real IP address ) via browser just read
the following
redbook
Chapter 6 Network configuration and
the HMC > 6.2.2 LAN Adapters
For ports if you are using HTTPS just open 443 in HMC's built in firewall
Remote HMC
A remote HMC is one that is network-connected to a distant managed server or HMC.