Unable to connect
If you are unable to access the Discover database, you should verify that you are using the appropriate full-qualified host name.
If you are running against a named database instance, then the
host name must follow a specific format: <host_name>\<instance_name> where <host_name> is
the IP address, the machine name, or localhost <instance_name> is
the name of the DB instance.
See "Using Discover Database Manager" in the Discover Databases Guide.