On Sat, 13 Nov 2021, Ekkard Gerlach wrote:

Sorry, my customer is bound to SL 6.10, a medical programm is only supported under 6.10 (and ubuntu 20.04)

Ubuntu 20.04 is an LTS version, in long-term support until ...
mainstream April 2023, extended security maintenance April 2030.

I would see when the medical program will be supported on Ubuntu 22.04
(the next Ubuntu LTS version, due out next spring) and move to Ubuntu 20.04 or 22.04.

, a new server was just installed 2 months ago for 25 linux workstations (XDMCP linux clients, Win10 with NX ). Thats the server for next 5-7 years!! No update possible, special features for userfriendly communication with medical server in internet only supported under 6.10. , NOT 7.x , 8.X!!



Once again: who has idea why nxserver 3.2.0-74 is locked/ blocked?

I see you are using
        xhost +
Even in SL6 that was considered very insecure.
Could you/they switch to xauth security instead ?

If you are using heavy graphics and need GPU, DRI or OpenGL you may be stuck with NX, but otherwise I would consider switching to using VNC
for the display connection.
Oh, I see that NX supports VNC clients; I would try that, perhaps in windowed mode if that suits your use, rather than having the whole desktop sesson on the medical server.

Am 13.11.21 um 21:08 schrieb Nico Kadel-Garcia:
On Sat, Nov 13, 2021 at 2:22 PM Ekkard Gerlach <e...@liburg.de> wrote:
Hello,

using SL 6.10, nxserver 3.2.0-74 .
Stop there. Update to SL 7 if you expect contemporary tools to work or
continue to work: the underlying RHEL 6 from upstream  The final
release of RHEL 6 was more than 3 years ago.

Nico Kadel-Garcia

root@arthur:~# export DISPLAY=10.0.0.9:1002.0
Sie haben neue Post in /var/spool/mail/root.
root@arthur:~# xterm
Warning: This program is an suid-root program or is being run by the root user.
The full text of the error or warning message cannot be safely formatted
in this environment. You may get a more descriptive message by running the
program as a non-root user or by removing the suid bit on the executable.
xterm Xt error: Can't open display: %s

but:
root@arthur:~# export DISPLAY=:1002.0
root@arthur:~# xterm
Warning: Cannot convert string "nil2" to type FontStruct
xterm: cannot load font -misc-fixed-medium-r-semicondensed--13-120-75-75-c-60-iso10646-1

works!!  (xhost + is in autostart of every user).


Why not accessible viel IP/ network? Only accessible local? What is locked on scientific?


example:

--pc44 30755 0.0 0.4 180096 120300 ? S 10:00 0:10 _ /usr/libexec/nx/nxagent -persistent -D -name NX - pc44@arthur:1002 - DavidX (GPL Edition) -option /home/pc44/.nx/C-arthur-1002-27736AF6397123CD7F3F645BCA8E28A4/options -nolisten tcp :1002


nxstarts with "-nolisten tcp". Where is that set? - In /etc/nxserver/node.conf:

#AGENT_EXTRA_OPTIONS_X="-nolisten tcp"   #    is commented out!!

When  I modify it to

AGENT_EXTRA_OPTIONS_X="-listen tcp"     # nolisten -> listen!

Then nxserver doesn't allow any login, aborts with error message

Error: Aborting session with 'Unrecognized option: -listen'.


anybody here can help?

Some security policy on SL 6.10 that forces nxserver to "-nolisten tcp" ?

Or: who or what forces to start nx with "-nolisten tcp" although its not commented in in node.conf?


tia

Ekkard


--
Andrew C. Aitchison                                     Kendal, UK
                        and...@aitchison.me.uk

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