Can't connect with UDL file to SQL Server 2016 but with SSMS it works without problems I have a strange issue using a UDL file.
I can't connect with the UDL file to SQL Server 2016 with a specific user (login) but when I'm trying to connect with the same user via SSMS,  it works without problems.

A Diffrent user can connect both ways without issues.

What's wrong with my user/UDL file?
I found what caused it - UDL connections doesn't allow using a different Windows NT authentication other than the current user.
The "Custom user" is only for SQL authentication.