Before I throw in the towel, I wanted to see if any of you had any input.

I have a customer running behind a raptor firewall, when they try and access a protected directory, they are receiving a "Waiting for end of response HTTP headers" error in their firewall log. The user is never prompted for their username or password. After waiting the web browser returns a 404 error.

I have submitted this to Plesk Support and they say it is a firewall configuration issue (I agree). Has anyone out there run into this situation? If you have, how did you resolve it?

Thanks.