How to handle two URL to control different Logon pages ...?

Dear experts,

We having one requirement.That is https://<host>:<port>/xxxx and  https://<host><port>/irj/portal like two urls using to display the logon page in Portal 7.0. We are tried https://<host><port>/irj/portal after any parameter maintaining means(https://<host><port>/irj/portal/page1 / https://<host><port>/irj/portal/page2) we can able to handling the two pages.But my problem is https://<host>:<port>/page1 we need to maintain like this.That time we are getting the 404 page not found error.

https://<host>:<port>/nwa timethis is redirect to SAP Stranded  logon page.Same process we need to implement in custom logon page.Any one can explain the /nwa that time How the stranded  logon page is triggering.Final without irj/portal we need different logon page and with irj/portal different logon page in sap PAR files we need to maintain.(My Logon page is JSPDynPage concept)

Please tell me any information for this.

Thanks,

Durga Rao.