Zones are not transferred to slave DNS server configured via Slave DNS Manager in Plesk

Symptoms

• Slave DNS server is configured with Slave DNS Manager extensions according to the documentation;
• In Plesk >  Extensions > Slave DNS Manager Slave DNS server is shown as up and running:
  
• Signals to refresh zones are received, but zones are not transferred. In /var/log/messages ; only the following entries appear after clicking Extensions > Slave DNS Manager > Resync:

  # tail -fn0 /var/log/messages
  named[3082]: received control channel command 'refresh example.com IN '
  named[3082]: received control channel command 'addzone example.com IN { type slave; file "example.com"; masters { 203.0.113.2; }; };'

Cause

Insufficient default permissions for BIND directory.

Resolution

1. Connect to the slave DNS server via SSH;
2. Adjust permissions as follows:
   

   # chown named.named /var/named/