That looks to me like your UDL file (used to set up the Database Connection) is misconfigured.
Common issues I have seen are not saving the password (select the checkbox) or not specifying the correct database on the server (usually defaults to "master".)
Please note, neither of these will cause a "test connection" to fail.
Finally, if you edit it, make sure you change the name before you re-upload it.
HTH