Is the machine local or remote? Can you connet to database using those credentials? Is the error message still the same?
You should probably also remove Persist Security Info="true" - but that won't fix your issue.
<add name="dashCommerce" connectionString="Data Source=2003-test;Initial Catalog=dash4;User ID=sa;Password=xxxxxxxx;" providerName="System.Data.SqlClient" />
Thanks,
Matthew
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