Unidac 9.4 and SQL-Server

Unidac 9.4 and SQL-Server

I'm trying to connect to a SQL-Server database. This works without any problems with Unidac 9.3.0. After installing Unidac 9.4.0 the application crashes. The reported error is
 2.5 Type          : EMSError
  2.6 Message       : TCP Provider:_Es konnte keine Verbindung hergestellt werden, da der Zielcomputer die Verbindung verweigerte.

What am I supposed to do?
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