QSqldatabase open() failed to connect SQL server on other than default 1433 port

[helen]

SQL server uses other than default 1433 port (e.g. 5555), system DSN created using the port 5555 and tested completed successfully.

However, QSqlDatabase failed to open database.

The code snippets:

QSqlDatabase *db = QSqlDatabase :: addDatabase("QODBC");
   db->setDatabaseName("test");       
   db->setUserName(userName);        
   db->setPassword(passWord);
 
   if ( db->open() ){
     ///Database open successfully.....
   }
   else
  {
     ///Database open failed 
   }

QSqlDatabase *db = QSqlDatabase :: addDatabase("QODBC");
   db->setDatabaseName("test");       
   db->setUserName(userName);        
   db->setPassword(passWord);

   if ( db->open() ){
     ///Database open successfully.....
   }
   else
  {
     ///Database open failed 
   }

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It's greatly appreciated for any help to solve this problem.