I have been given a copy of a DNN site from my client and he has asked me to test it locally then move it to another hosting provider (current provider is not very service oriented, if you get my drift).  I have the site and db.  I have restored the db and put the site into IIS locally and set the App Pool.   First run through a database connection error message.  I got that worked out and not I get an error that says nothing.  Literally says "DNN Error" and a button to "return to site", that's it.  How do you debug something like this?  And what am I missing?  I have added localhost to the PortalAlias table.