>>>>> "Brian" == Brian May <bmay@csse.monash.edu.au> writes:

    Brian> Gnus shows me the complete article.

    Brian> Everything looks OK to me except Gnus cannot identify the
    Brian> message number. I don't know why, the correct number is on
    Brian> the Xref header, which looks OK to me.

    Brian> I have run telnet to the nntp port of the server, and tried
    Brian> some commands (eg HEAD and ARTICLE). Everything looks OK to
    Brian> me.

    Brian> Perhaps if I get a chance, I might try to find the PGnus
    Brian> code that extracts the message number from the headers.
    Brian> Obviously it is not working to well (here).  -- Brian May
    Brian> <bmay@csse.monash.edu.au>

Sorry to followup my own mail ;-) - however, I think the following
might help.

I was experimenting with the 'trace-function-background'
function, and got the following: