>Date: Mon, 25 Oct 1999 15:09:21 -0700 (PDT)
>From: daniel@synchrods.synchrods.COM (Daniel Senderowicz)
>
>I just found out that the NetBSD default error file for xdm is
>in /var/log.  This contains:
> [...]
>AUDIT: Fri Oct 22 10:36:28 1999: 180 X: client 3 rejected from local host
>Xlib: connection to ":0.0" refused by server
>Xlib: Client is not authorized to connect to Server
>Error: Can't open display: :0
> [...]

Make sure that:

- you are not already running an X display (i.e. you should be
  starting xdm from the text console)
- you are running xdm as root

good luck,
entropy

--
entropy