Do you registered an international domain name with accent?
You need a tool for make convertion IDN-Domain to ACE string for every top domains.
The convert is working for cPanel, PlanetHoster, DNS server (BIND9/NSD/MyDNS), FTP (ProFTPd/PureFTPd), htaccess, ...
When you use a domain name that contains international characters, you need to convert the domain name "Punycode" before inserting it in the configuration files. You can use this function to convert your domain names and retrain.
Perform an IDN / ACE conversion
You can use this function to convert and re-convert your domain names.