ORA-30698
network connection failed: connection refused
Cause
The network connection attempt did not succeed. This form of error typically indicated that the target network port was misspecified, that there was a machine running at the target network host address but the particular program expected to accept the connection was not running, or that a firewall rejected the connection attempt.
Action
Ensure that the network target is correctly specified, that the desired target program is running and is listening on the expected network address and port, and that there isn't a network connectivity or firewall problem, then retry the operation.