Directory and Resource Administrator (DRA) 8.x clients cannot connect to the Administration server. (NETIQKB55542)

Directory and Resource Administrator (DRA) 8.0 clients cannot connect to the Administration server.
Error: Unable to connect to Administration server [name]. This error occurs if your account cannot be authenticated by the domain in which the Administration server is running or if the server is not running at all.

How do I configure DCOM for DRA 8.x?

Configuration steps detailed in Installation Guide were not followed on how to configure DCOM for DRA.  These steps still need to be performed.  This information is covered in detail on Page 46 of the DRA 8.0 Installation Guide under "Configuring DCOM Settings".

DCOM on Windows 2003 SP1 (or later) has not been configured correctly on the DRA server(s) and/or domain controllers.

Formerly known as NETIQKB55542

For DRA 8.1, DCOM only needs to be configured on the DRA servers; it no longer needs to be configured on the domain controllers since the DRA Agent on 8.1 no longer fascilitates authentication to connect to DRA servers.  This is done through Server Connection Points (SCPs) now.