ORA-16665

 Database: 12c Release 1

Error code: ORA-16665
Description: timeout waiting for the result from a database
Cause: The Data Guard broker was forced to time out a network connection to a remote database because: - The network call to the remote database did not complete in a timely manner. - The remote database was unable to execute the command due to an instance failure.
Action: Check Data Guard broker logs for the details of the failure. If the network call did not complete in a timely manner, increase the CommunicationTimeout configuration property value and reissue the command.

Database: 11g Release 2
Error code: ORA-16665
Description: timeout waiting for the result from a database
Cause: The Data Guard broker was forced to time out a network connection to a remote database because: - The network call to the remote database did not complete in a timely manner. - The remote database was unable to execute the command due to an instance failure.
Action: Check Data Guard broker logs for the details of the failure. If the network call did not complete in a timely manner, increase the CommunicationTimeout configuration property value and reissue the command.