As I said, they are not being logged in SQL Server's error log hence I don't think the connection ever gets to an attempt to log into SQL Server. If I uncheck the box to use windows authentication, I do get a message in the log showing the failed sql server login. When I use my account which has no SPN but is an server admin, I get the error showing an untrusted domain. When I use the domain account I want to use that has SPN's, I never see an attempt to log into SQL Server nor an error message.