problem with checking domain roles

[Peter]

Hello!

I have a problem with web.config's <allow roles>. Everything works fine on
my development machine, but when I deploy my application into production
server the role checking is not working correctly. Application is able to
check for right builtin roles but domain roles checking fails.

<allow roles="BUILTIN\Administrators"> THIS WORKS
<allow roles="mydomain\Domain Admins"> THIS DOESN'T WORK

Please could somebody advice, what could be wrong? Your help is very much
appreciated!

Thanks.

Peter