How to access SAP Portal 7.4 using default ports

Good day , i have implements SAP Portal 7.4 as an external facing portal .

I am using the follow url https://zimeservices.pfms.gov.zw:44300/irj/portal/anonymous/

I would like to use https://zimeservices.pfms.gov.zw

I dont was to specify the port number. I tried changing the ports using SAP Note  1577357 but its not working.

Please assist .

thanks