I tried attaching a DNN database (from another DNN site) to a DNN site which already was functioning with different DNN database, which affected login to the DNN web site.(host/dnnhost)

Login Failed, remember that Passwords are case sensitive

I have tried to copy my production database from a hosting service to my local machine, and would like to be able to point my local copy of DNN (same version) at this copy.  Aside from the sql connections which now point to my local copy of the database, there appear to be pointers inside the database tables that also affect my ability to do this.  The HostSettings table contains a HostURL that points to the original site where the database came from, and the PortalAlias table also points to the original URL.  When I change these to point to my localhost/CopyOfDNN web site, it still refuses to run, and I get just a generic error page.  This is version DNN 4.4.1 if that makes a difference. 

The web.config file contains the machinekey / validationkey / decryptionkey values that were in place on the original server, and  I have validated that the login / pwd have access to the database just fine.

Do you have any ideas on what else could be the problem?