I have a simple RMS deployment (single server) with XP Clients running Office 2007. We are at RMS SP2. When end users try to apply permissions to a document or email they are prompted for credentials. They can supply them or hit cancel and the authentication works and they can successfully apply a security template. I am having a hard time determinging why the users are being prompted for credentials. The security logs on the RMS server show a failed NTLM event and then successfull NTLM and Kerberos events. Thanks!!