Unable to start DNS service: bad owner name (check-names)

Symptoms

• DNS service cannot be started in Plesk with the following error:
  

  PLESK_ERROR: Unable to manage service by dnsmng: ('start','dns'). Error:

• The following error can be found in /var/log/messages while trying to start named-chroot service:
  

  CONFIG_TEXT: named-checkconf: example.com:37: _dmarc.example.com: bad owner name (check-names)
  named-checkconf: zone example.com/IN: loading from master file example.com failed: bad owner name (check-names)
  named-checkconf: zone example.com/IN: not loaded due to errors.

• In /var/named/chroot/var/example.com it can be found that _dmarc.example.com is the A record.

Cause

Resolution

1. Connect to the server via SSH.
2. Backup /var/named/chroot/var/example.com:
   

   # cp /var/named/chroot/var/example.com{,.bck}

3. Open /var/named/chroot/var/example.com with any text editor and comment out the _dmarc.example.com line.
4. Start named-chroot service:
   

   # service named-chroot start