BIND daemon is failing to start after an update

Symptoms

After updating system packages (for example, within ispmanager 6 update), daemon of the DNS server BIND is failing to start and following errors occurred:

named[44257]: /etc/bind/named.conf.options:25: option 'dnssec-enable' no longer exists
named[44257]: loading configuration: failure

Causes

The DNS server BIND updated to version 9.18.0 that is no longer support the option «dnssec-enable». It was made obsolete in version 9.16.0.

Solution

Remove or comment strings with dnssec-enable yes; and dnssec-lookaside auto; in BIND configuration file at /etc/bind/named.conf.options.

After applying changes, restart BIND daemon by executing following command:

systemctl start bind9