WCF Service returns 400 Bad Request

Question

I\'ve got this application that works locally and when deployed and using a .mdf SQL Express database file (which I usually use for testing purposes). However, when I change

Answer 1

A database connection from a hosted WCF Service is considered a remote connection so make sure your connection strings specifies the authentication method. So try using Integrated Security=SSPI in your connection string and if that doesn't work make sure that your Application Pool's Identity is set to a domain account that has permissions on the SQL server. :)