Connection Error(s):
Index #: 0
Source: .Net SqlClient Data Provider
Class: 14
Number: 15364
Message: Failed to generate a user instance of SQL Server. Only an integrated connection can generate a user instance. The connection will be closed.

I received this after adding the DB name in the server field.

System.ArgumentException: Invalid value for key 'attachdbfilename'. at System.Data.SqlClient.SqlConnectionString.VerifyLocalHostAndFixup(String& host, Boolean enforceLocalHost, Boolean fixup) at System.Data.SqlClient.SqlConnectionString..ctor(String connectionString) at System.Data.SqlClient.SqlConnectionFactory.CreateConnectionOptions(String connectionString, DbConnectionOptions previous) at System.Data.ProviderBase.DbConnectionFactory.GetConnectionPoolGroup(String connectionString, DbConnectionPoolGroupOptions poolOptions, DbConnectionOptions& userConnectionOptions) at System.Data.SqlClient.SqlConnection.ConnectionString_Set(String value) at System.Data.SqlClient.SqlConnection.set_ConnectionString(String value) at System.Data.SqlClient.SqlConnection..ctor(String connectionString) at Microsoft.ApplicationBlocks.Data.SqlHelper.ExecuteReader(String connectionString, CommandType commandType, String commandText, SqlParameter[] commandParameters) at Microsoft.ApplicationBlocks.Data.SqlHelper.ExecuteReader(String connectionString, CommandType commandType, String commandText) at Microsoft.ApplicationBlocks.Data.SqlHelper.ExecuteReader(String connectionString, String spName, Object[] parameterValues) at DotNetNuke.Data.SqlDataProvider.TestDatabaseConnection(DbConnectionStringBuilder builder, String Owner, String Qualifier) at DotNetNuke.Services.Install.InstallWizard.TestDatabaseConnection() at DotNetNuke.Services.Install.InstallWizard.wizInstall_CustomButtonClick(Object sender, EventArgs e) at System.Web.UI.WebControls.LinkButton.OnClick(EventArgs e) at System.Web.UI.WebControls.LinkButton.RaisePostBackEvent(String eventArgument) at System.Web.UI.WebControls.LinkButton.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) at System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) at System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)

Thank you Sebastian,

Below is the listed error i was getting before I selected the option to add the database name. Can you tell me what I may have missed?

Connection Error(s):
Index #: 0
Source: .Net SqlClient Data Provider
Class: 14
Number: 15364
Message: Failed to generate a user instance of SQL Server. Only an integrated connection can generate a user instance. The connection will be closed.

I'm trying to use an old DB that I was using for a 4.9 install. Is this possible to do or do I need to setup a new DB for this new install?

What I have done, so far, is to use dotnetuke as the DB name, my old user name for the db user name and the old password for the DB password name.

Now I am getting a splash screen that says , " Site Under Construction". Does this indicate that I have something not configured properly?