directadmin อนุญาต username ที่มีหมายเลข
vi /usr/local/directadmin/conf/directadmin.conf
If you add:
allow_numeric_username=1
to your directadmin.conf and restart DA, it will allow you to start a username with a number, which bypasses the check.
service directadmin restart
Note that we have seen issues were services confuse numerical usernames with user ID numbers, so we still don't advise using this.
ที่มา https://www.directadmin.com/features.php?id=685