After a Plesk Debian server reboot, and a manual DNS start trial (DNS wasn’t starting automatically),
Plesk wasn’t able to start the DNS server because of a locking error.
/opt/psa/admin/bin/dnsmng ‘–status’ failed with message: dnsmng: Unable to open file “/var/lock/files/23d9c96d428d491d87bd37baeae57baf”: No such file or directory.
System error 2: No such file or directory
A “touch /var/lock/files/23d9c96d428d491d87bd37baeae57baf” in the ssh console, and DNS wasn’t complaining anymore and started flawlessly.