allowing root to display to a user's X session

To: <debian-user@lists.debian.org>
Subject: allowing root to display to a user's X session
From: David Wright <ichbin@shadlen.org>
Date: Mon, 19 Nov 2001 13:25:47 -0800 (PST)
Message-id: <[🔎] Pine.LNX.4.33.0111191318300.4495-100000@maurice.rprc.washington.edu>

When troubleshooting on RedHat, I often log in to a X session as a user,
then su to root in an xterm and run ethereal (a packet-sniffer with GUI)
to watch the network traffic that results from my actions as a user.

I would like to do this on Debian, but when I try to start ethereal, I get
the error message:
  Xlib: Client is not authorized to connect to Server
Apparently root is not allowed to display to a user's X session. How can I
allow this?

Running testing with kernel 2.4.12 and XFree86 4.1.0-9.

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Follow-Ups:
- Re: allowing root to display to a user's X session
  - From: DvB <dvanbalen@jam.rr.com>
- Re: allowing root to display to a user's X session
  - From: "Thomas R. Shemanske" <trs@hecke.dartmouth.edu>
- Re: allowing root to display to a user's X session
  - From: Frank Copeland <fjc@thingy.apana.org.au>

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