I moved an entire dnn site from one ISP to another by copynig the database and file structure to a folder that was already had the proper permissions.  The site consists of one parent and one child portal.  I changed the aliases to recognize the new address and the parent works fine but the child doesn't.  DNN completely ignores the alias so IIS looks for a virtual directory of the same name.  I created the directory and threw a "you shouldn't see this page" page in it just to confirm that the above is happening.

So...what could be breaking the alias?  And...yes...I've doublechecked it for errors.