Dear, an our customer ask us to register a domain with Cyrillic fonts. We have found a registrar that permit register domain in Cyrillic, but i'm not sure that ispconfig suppor them. We can configure a domain Cyrillic (in terms of DNS zone and web directory) inside ispconfig panel? Thank you for your support.
Yes, you can use any kind of IDN domains in ispconfig. Just enter them in puniycode notation or install the php-idn extension for php if you want to enter them in the native charset instead of punicode.