Path: ...!weretis.net!feeder8.news.weretis.net!news.usenet.ovh!.POSTED!not-for-mail
From: JKB <JKB@hilbert.invalid>
Newsgroups: comp.os.vms
Subject: simh and xdmcp
Date: Fri, 23 May 2025 07:13:09 -0000 (UTC)
Organization: NUO - News.Usenet.Ovh
Message-ID: <slrn1030805.6kn.JKB@hilbert.systella.fr>
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	Hello,

	I'm trying to configure XDMCP on OpenVMS 7.3/VAX (running on simh)
	and I'm unable to obtain a running configuration.

	X server is Xephyr running on hilbert (192.168.10.103). In a first
	time, I have configured xdmcp on a foreign NetBSD server
	(legendre, 192.168.10.128).

	With followin command:
hilbert:[~] > Xephyr -ac :1 -screen 1024x768 -listen tcp -query legendre
	a nested X server is displayed with remote XDM. I can open a
	graphical session on legendre.

	Now, as Xephyr runs as expected, I try to configure OpenVMS running
	on fermat (192.168.10.107).

	fermat can ping hilbert (there is no firewall between hilbert and
	fermat). I launch Xephyr on hilbert:
hilbert:[~] > Xephyr -ac :1 -screen 1024x768 -listen tcp -query fermat

	tcpdump shows following packets:
08:58:33.645218 IP hilbert.systella.fr.47532 > fermat.systella.fr.xdmcp: UDP, length 7
08:58:33.766675 ARP, Request who-has legendre.systella.fr tell fermat.systella.fr, length 46
08:58:33.813541 ARP, Request who-has hilbert.systella.fr tell fermat.systella.fr, length 46
08:58:33.813558 ARP, Reply hilbert.systella.fr is-at d4:5d:64:b4:9a:3b (oui Unknown), length 28
08:58:33.813791 IP fermat.systella.fr.xdmcp > hilbert.systella.fr.47532: UDP, length 47
08:58:33.813959 IP hilbert.systella.fr.47532 > fermat.systella.fr.xdmcp: UDP, length 106
08:58:35.316469 IP fermat.systella.fr.xdmcp > hilbert.systella.fr.47532: UDP, length 52
08:58:35.316636 IP hilbert.systella.fr.47532 > fermat.systella.fr.xdmcp: UDP, length 29
08:58:37.317081 IP hilbert.systella.fr.47532 > fermat.systella.fr.xdmcp: UDP, length 29
08:58:38.777066 ARP, Request who-has fermat.systella.fr tell hilbert.systella.fr, length 28
08:58:38.802655 ARP, Reply fermat.systella.fr is-at 08:00:2b:7a:39:2e (oui Unknown), length 46
08:58:41.321144 IP hilbert.systella.fr.47532 > fermat.systella.fr.xdmcp: UDP, length 29
08:58:49.329070 IP hilbert.systella.fr.47532 > fermat.systella.fr.xdmcp: UDP, length 29
08:59:05.345153 IP hilbert.systella.fr.47532 > fermat.systella.fr.xdmcp: UDP, length 29
08:59:10.521103 ARP, Request who-has fermat.systella.fr tell hilbert.systella.fr, length 28
08:59:10.532610 ARP, Reply fermat.systella.fr is-at 08:00:2b:7a:39:2e (oui Unknown), length 46

	Thus, Xephyr (running on hilbert) sends packets to fermat (OpenVMS
	7.3) on port 177/UDP. And fermat answers.

	On VMS side, I have an error in SYS$SPECIFIC:[TCPIP$XDM]TCPIP$XDM_RUN.LOG:
%NONAME-F-NOMSG, Message number 00000004
%SYSTEM-S-NORMAL, normal successful completion
%NONAME-F-NOMSG, Message number 00000004
%SYSTEM-S-NORMAL, normal successful completion
%NONAME-F-NOMSG, Message number 00000004
[338 1747983672] xdm error: Cannot accept chooser connection

	XACCESS.TXT only contains:
*                                       #any host can get a login window

	I suppose I have done a mistake or I have a misconfiguration
	somwhere on VMS side. Help will be welcome.

	Best regards,

	JB

PS: I have tried to open a terminal with another error:
$ show display

    Device:    WSA16:  [super]
    Node:      192.168.10.103
    Transport: TCPIP
    Server:    1
    Screen:    0

$ create/term/detach
%DECW-E-CANT_OPEN_DISPL, Can't open display

	Of course, with the same configuration, I can open a xterm from
	foreing NetBSD server to Xephyr.


-- 
Si votre demande me parvient en code 29, je vous titiouillerai volontiers
une réponse.