Question: Why some services listenes on two different ports?

Hi Everyone,

Could any one please tell me as why the following services in XIR2 listenes on two different ports while the others only on one; even if the -requestport is setup?

The servers listening on two different ports are:

-Desktop Intelligence Report Server

-Crystal Reports Page Server

-Report Application Server

& CMS.

I checked it using netstat -anb as well as using some tools like ports explorer.

Please assist me with this, thanks in advance.

~Salena