Non-domain machines cannot launch RemoteAPP

Hi.

I have Server 1 with RDS WEB and RD Gateway Role. And I have Server 2 with RDS Host, License Manager, RemoteApp installed and they are in collection.

For test: I installed certificate of Enterprise CA on non-domain computer and now it connects successfully to RDS Web service (globalDNSname.mycompany.com). Non-Domain computers login to RDWeb well (certificate is good). But when I launch RemoteApp it asks me credentials and write that logon is unsuccessfull.

It works with domain computers and asks no credentials. Certificate is isssued to globalDNSname.mycompany.com.

Could you help me?