DbiClient
From Support Wiki
DBI Client Errors
Error Message:[UNIFY][UnifyClient ODBC Driver][UnifyClient][Unify Client LNA] Disconnect Error; Transaction rolled back. First, make sure that you do not have any extra spaces after the Driver= and DBQ= lines in your odbcdmn.ini file. An added spacebar press can cause this error.
Next, check to make sure that your DBQ is set to the correct directory of your database.
Error Message: :[UNIFY][UnifyClient ODBC Driver][Unify LNA][iODBC][Driver Manager]Data source name not found and no default driver specified. Driver could not be loaded.
Check your DSN that you set up on the client machine and verify;
1. The port number is the same as you designated in your odbcdmn.ini file on the server side.
2. The DSN name also matches the server side entry you made in the odbcdmn.ini file as well.