Newer version of named don't like special characters. By defaults directadmin allows them, as older versions did accept those characters. A new option has been added, with internal default: allow_domain_special_characters=1 If you want to block Users from adding domains with special characters, set: allow_domain_special_characters=0 and restart directadmin. Ensure there are not already domain with special characters (greater than ASCII 127). If Users run into this error, then they must add their domains to DirectAdmin in pundy-code format, see link below. Once DirectAdmin fully supports IDN/puncode domains, then it will automatically convert IDN domains into punycode format, and this setting will default to 0.