[Koha] site displays maintenance page on url

Hi, I have tried to configure koha and succesfully used it by only using an ip address to reach it. now i have tried to link a domain to it as well but i get the following error: a) if i surf to the ip address: everything works as expected b) if i surf to the domainname i tried to attach to it (i have altered the koha-httpd.conf file) i get the maintenance page (cgi-bin/koha/maintenance.pl) . any hints welcome! thanks, Klaas