RoboHelp Server 10 : Test Connection to local SQL BD keep failing using JDBC

Hi team, 

I'am currently trying to migrate our RH application from v9 to v10 ! We backed-up and restored our prod DB on a test environnement, we installed RH10 on a win2019 server and also SQL2014 on same server ! 

When trying to test the connection to the local database it's not working ! Always we get a Connection Failed error message ! 

What is surprising is that we got connection successful to the same sql express DB by using TestDatabase.udl application. 

We also followed the recommendation mentionned above on this discussion but no chance : 

Database URL  ----- >      jdbc:sqlserver://localhost

Database User Name ------>      <your username>

Database Password           ------>      <your pwd>

JDBC Driver Class           ------>      com.microsoft.sqlserver.jdbc.SQLServerDriver

JDBC Driver Path           ------>      "C:\Program Files\Apache Software Foundation\Tomcat 8.5\lib\mssql-jdbc-9.4.0.jre8.jar"

Any suggestion please ? I asked the support for assistance but it's taking a long time and no answer for the moment !