There are 5 most common reasons for failing to connect to the database:
The database is not available from the Internet
Contact your database administrator.
The database blocks incoming traffic from the Integrator's IP address
Whitelist the IP address of Etlworks Integrator. There are 2 addresses for shared instances:
The connectional parameters are not properly configured
Read how to configure connections for databases supported by Etlworks Integrator.
The credentials are wrong
Check the credentials with the database administrator.
The database requires a secure connection over SSL
The Etlworks doesn't have a JDBC driver for the database
Contact your system administrator or Etlworks support.