How to redirect port 80 to 50000 in NetWeaver 7.4 ?

Dear Experts,

My Customer has pure SAP portals without ABAP. They want me to configure all these URLs:

http://FQDN1:50000

http://FQDN1:80

http://FQDN2:50000

http://FQDN2:80

to point to:

http://FQDN1:50000/some_cust_app/index.html.

I guess that for the first one, it should be:

icm/HTTP/redirect_0 = PREFIX=/, TO=/come_cust_app/index.html

and for the others, I don't know. Maybe for the second one it should be:

icm/HTTP/redirect_0 = PREFIX=/, TO=/come_cust_app/index.html, PORT=80

but I'm not sure. Or perhaps ...... , PORT=50000 ? The SAP documentation is very poor,

they don't have examples for my case.

For the third and the fourth, maybe I will need a virtual hostname. Preparations for that have

been done. Please kindly guide on how to accomplish that.

Many thanks in advance!