I am in middle of testing further certbot dns-01 validation for ISPConfig with Bind9 as discussed in other thread and I thought I shared this little tool I created based on the older version of resync.php of ISPConfig 3.1. You may view its content at https://github.com/ahrasis/ISPConfig-Tools/blob/master/resync_dns.php, clone it or whatsoever. To use it, simply download it and simply run in in your terminal: Code: wget https://raw.githubusercontent.com/ahrasis/ISPConfig-Tools/master/resync_dns.php --no-check-certificate php -q resync_dns.php your.domain.tld And if domain name (your.domain.tld.) isn't supplied, all zones will be resynced instead.