Inform the user of the rndc client that the rndc client being used might not be downward compatible with the named server software. Temporarily disable this client through the controls address match list in the named server configuration file, or completely disable rndc by removing the controls statement from the named server configuration file. Any changes to the named server configuration file must be followed by an rndc reload or SIGHUP signal to re-read the named server configuration file.