When deploying the FIM Portal the page is built on WSS 3.0. You may notice that after deploying the Portal you are just displayed by the default WSS 3.0 page when browsing locally or remotely.
When you deploy the FIM Service and FIM Portal it actually installs two .wsp’s which style the SharePoint site in accordance to the FIM Portal functionality. Sometimes after initial installation these features are not enabled by default. To enable them navigate to Central Administration > Site Actions > Site Settings > Site Features and select Activate on both ILM2 Pages and FIM Password Reset Pages
You should then be able to navigate to the url locally and remotely and see the normal FIM Portal page
Hope this helps some headaches as there arent too many pointers as to why this happens