Change Portal Domain

Hi,

I have installed SAP Enterprise Portal 6.0 SP2

I can access the Portal with the URL

http://ispci:50000/irj.

Now I would like to change the domain to something like

http://ispci.xyz.com:50000/irj

Can anyone please let me know how do I do this ?

Also where do I change the Port 50000 to any other port ?

Thanks in advance

Vivek