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From: JKB <JKB@hilbert.invalid>
Newsgroups: comp.os.vms
Subject: Re: simh and xdmcp
Date: Tue, 27 May 2025 12:31:46 -0000 (UTC)
Organization: NUO - News.Usenet.Ovh
Message-ID: <slrn103bc5i.6kn.JKB@hilbert.systella.fr>
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Le 27-05-2025, Simon Clubley <clubley@remove_me.eisner.decus.org-Earth.UFP> a écrit :
> On 2025-05-27, JKB <JKB@hilbert.invalid> wrote:
>>  
>> $ mcr sys$system:decw$clock
>> X Toolkit Error: Can't Open display
>> %DWT-F-NOMSG, Message number 03AB8204
>> $ 
>>
>> 	I don't understand difference between BSD export DISPLAY && xterm
>> 	and VMS set/display followed by mcr. There is no firewall on LAN.
>>
>
> This is now a job for Wireshark.

	I don't have wireshark but I have tried to check traffic with
	tcpdump.

	Between NetBSD server and Xephyr, when I try to open an xterm,
	there is a lot of packets on port x11-1. Now, I check packets
	between Xephyr and OpenVMS :

Root hilbert:[~] > tcpdump -p host 192.168.10.107 and ! port 23
tcpdump: verbose output suppressed, use -v[v]... for full protocol decode
listening on eth0, link-type EN10MB (Ethernet), snapshot length 262144 bytes
14:29:53.056530 ARP, Request who-has hilbert.systella.fr tell fermat.systella.fr, length 46
14:29:53.056557 ARP, Reply hilbert.systella.fr is-at d4:5d:64:b4:9a:3b (oui Unknown), length 28

	Of course, I have tried to run mcr sys$system:decw$clock on VMS's
	side. Thus, VMS does't send packet to Xephyr even is display is set:
$ mcr sys$system:decw$clock
X Toolkit Error: Can't Open display
%DWT-F-NOMSG, Message number 03AB8204
$ show display
 
    Device:    WSA21:  [super]
    Node:      192.168.10.103
    Transport: TCPIP
    Server:    1
    Screen:    0
 
$

	Best regards,

	JB

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