SP2010 Public facing Enterprise Search problem

Hi

I have strange problem with Public facing Sp2010 (SP1 + latest hotfix) site.

I have site column DocType(choice) which is used in advanced search.

Managed property was created to filter by column value.

Search by Managed property works fine when I do it from the server using http://server_name but returns no results when it's done using domain name http://www.domain-name.com

Generic search works fine, AAM is configured and Managed property is actually the only problem.

Any ideas?

Regards
Kirill