0 MikeGore 7 Years Ago Hi, I know the format is right, but what is my user ID and password. I get this error when I try to open the webpage on localhost: HTTP Error 500.19 - Internal Server Error The requested page cannot be accessed because the related configuration data for the page is invalid. And it is highlighting this part: <add key="ConnectionString" value="Data Source=127.0.0.1\SQLEXPRESS;Initial Catalog=UDG;Persist Security Info=True;User ID=username;PWD=password;"/> I am using SQL Server 2005 express. I am running this on my computer, still working on the webpage, so no remote server or anything just want to access the webpage I have done on my PC. How do I find out what my username and password is. I am not sure if 127.0.0.1 is correct, but as I said I am running this on my computer. Its IE7. Tried localhost, didn't work Thanks, Mike asp.net Edited 7 Years Ago by peter_budo: Keep It Organized - For easy readability, always wrap programming code within posts in [code] (code blocks) and [icode] (inline code) tags.