ORA Database Error Messages ORA-16781: the status of redo transport service for a database is unknown October 11, 2015 mpbod ORA-16781: the status of redo transport service for a database is unknown Cause: The redo transport service status to a standby database could not be determined. Action: Check the Data Guard broker log and Oracle alert log for more details. Back to previous menu Share this:Click to email a link to a friend (Opens in new window)Click to print (Opens in new window)Click to share on Facebook (Opens in new window)Click to share on LinkedIn (Opens in new window)Click to share on Tumblr (Opens in new window)Click to share on Twitter (Opens in new window)Click to share on Pinterest (Opens in new window)Click to share on Reddit (Opens in new window)Click to share on Pocket (Opens in new window)