Not able to connect with Apple M3

[or-ims]

Describe the bug

I am trying to start a xpra session with a client running Mac OS Sonoma on a M3 and a server running ubuntu 20.04. After reporting multiple errors the process ends with "server connection failure". I can't tell, which error report is relevant and which is not.
Unfortunately, I can't install any software on the server, e.g. to update the server's xpra version.

Any help is appreciated :)

The terminal output is posted below:

<user>@dyn-094098 ~ % xpra start ssh://<user>@<server> --start-child=xterm
grep: /usr/share/locale/locale.alias: No such file or directory
grep: /usr/share/locale/locale.alias: No such file or directory

2023-11-21 14:55:25,154 Xpra GTK3 client version 6.0-r34709 (g5a97fac04) beta
2023-11-21 14:55:25,164  running on Mac OS X
2023-11-21 14:55:25,164  cpython 3.11
xpra main error:
Traceback (most recent call last):
  File "/Applications/Xpra.app/Contents/Resources/lib/python/xpra/scripts/main.py", line 124, in main
    return run_mode(script_file, cmdline, err, options, args, mode, defaults)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Applications/Xpra.app/Contents/Resources/lib/python/xpra/scripts/main.py", line 475, in run_mode
    return do_run_mode(script_file, cmdline, error_cb, options, args, mode, defaults)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Applications/Xpra.app/Contents/Resources/lib/python/xpra/scripts/main.py", line 670, in do_run_mode
    return run_splash(args)
           ^^^^^^^^^^^^^^^^
  File "/Applications/Xpra.app/Contents/Resources/lib/python/xpra/scripts/main.py", line 2428, in run_splash
    return splash.main(args)
           ^^^^^^^^^^^^^^^^^
  File "/Applications/Xpra.app/Contents/Resources/lib/python/xpra/gtk/dialogs/splash.py", line 298, in main
    with program_context("splash", "Splash"):
  File "/Applications/Xpra.app/Contents/Resources/lib/python/xpra/platform/__init__.py", line 83, in __enter__
    init(self.prgname, self.appname)
  File "/Applications/Xpra.app/Contents/Resources/lib/python/xpra/platform/__init__.py", line 25, in init
    do_init()
  File "/Applications/Xpra.app/Contents/Resources/lib/python/xpra/platform/darwin/__init__.py", line 15, in do_init
    from AppKit import NSApp
  File "AppKit/__init__.pyc", line 148, in <module>
  File "AppKit/__init__.pyc", line 12, in _setup
  File "Foundation/__init__.pyc", line 188, in <module>
  File "Foundation/__init__.pyc", line 12, in _setup
  File "CoreFoundation/__init__.pyc", line 37, in <module>
  File "CoreFoundation/__init__.pyc", line 12, in _setup
  File "objc/__init__.pyc", line 6, in <module>
  File "objc/_objc.pyc", line 14, in <module>
  File "objc/_objc.pyc", line 10, in __load
  File "imp.pyc", line 343, in load_dynamic
ImportError: dlopen(/Applications/Xpra.app/Contents/Resources/lib/python/lib-dynload/objc/_objc.so, 0x0002): symbol not found in flat namespace '_ffi_find_closure_for_code_np'

grep: /usr/share/locale/locale.alias: No such file or directory
2023-11-21 14:55:25,974 GStreamer version 1.22.6
2023-11-21 14:55:25,985 Warning: cannot enable SSH socket upgrades
2023-11-21 14:55:25,985  cannot import name 'exceptions' from 'cryptography.hazmat.bindings._rust' (/Applications/Xpra.app/Contents/Resources/lib/python/cryptography/hazmat/bindings/_rust/__init__.pyc)
2023-11-21 14:55:25,993 created unix domain sockets:
2023-11-21 14:55:25,993  '/Users/<user>/.xpra/clients/dyn-094098.<net>-6953'
2023-11-21 14:55:26,040 Warning: no keyboard support, dlopen(/Applications/Xpra.app/Contents/Resources/lib/python/lib-dynload/objc/_objc.so, 0x0002): symbol not found in flat namespace '_ffi_find_closure_for_code_np'
2023-11-21 14:55:26,275 OpenGL enabled on 'Apple M3 Pro'
2023-11-21 14:55:26.288 Xpra[6953:167385] WARNING: Secure coding is not enabled for restorable state! Enable secure coding by implementing NSApplicationDelegate.applicationSupportsSecureRestorableState: and returning YES.
/Applications/Xpra.app/Contents/Resources/lib/python/xpra/client/gtk3/statusicon_tray.py:39: DeprecationWarning: Gtk.StatusIcon.set_tooltip_text is deprecated
  self.tray_widget.set_tooltip_text(self.tooltip or "Xpra")
/Applications/Xpra.app/Contents/Resources/lib/python/xpra/client/gtk3/statusicon_tray.py:106: DeprecationWarning: Gtk.StatusIcon.get_geometry is deprecated
  ag = self.tray_widget.get_geometry()
/Applications/Xpra.app/Contents/Resources/lib/python/xpra/client/gtk3/statusicon_tray.py:167: DeprecationWarning: Gtk.StatusIcon.set_from_pixbuf is deprecated
  self.tray_widget.set_from_pixbuf(tray_icon)
/Applications/Xpra.app/Contents/Resources/lib/python/xpra/client/gtk3/statusicon_tray.py:46: DeprecationWarning: Gtk.StatusIcon.set_visible is deprecated
  self.tray_widget.set_visible(True)
/Applications/Xpra.app/Contents/Resources/lib/python/xpra/gtk/info.py:353: DeprecationWarning: Gdk.Screen.get_width is deprecated
  sw, sh = screen.get_width(), screen.get_height()
/Applications/Xpra.app/Contents/Resources/lib/python/xpra/gtk/info.py:353: DeprecationWarning: Gdk.Screen.get_height is deprecated
  sw, sh = screen.get_width(), screen.get_height()
2023-11-21 14:55:26,330  desktop size is 3840x2369:
2023-11-21 14:55:26,331   dyn-094098.<net> (445x4544 mm - DPI: 219x13)
2023-11-21 14:55:26,331     2                1920x1200 at    0x0    (518x331 mm - DPI: 94x92) workarea: 1920x1175 at    0x25
2023-11-21 14:55:26,331     1                1920x1200 at 1920x0    (518x331 mm - DPI: 94x92) workarea: 1920x1175 at 1920x25
2023-11-21 14:55:26,331     monitor 3        1800x1169 at 1049x1200 (301x195 mm - DPI: 152x152) workarea: 1800x1065 at 1049x1244
Warning: the 'start-child' option is used,
 but 'exit-with-children' is not enabled,
 you should just use 'start' instead
Entering daemon mode; any further errors will be reported to:
  '/run/user/31092/xpra/S2223439/server.log'
Actual display used: :12
Actual log file name is now: '/run/user/31092/xpra/12/server.log'
2023-11-21 14:55:29,494 removing unix domain socket '/Users/...-6953'
/Applications/Xpra.app/Contents/Resources/lib/python/xpra/gtk/notifier.py:175: DeprecationWarning: Gtk.Window.set_opacity is deprecated
  self.set_opacity(0.2)
/Applications/Xpra.app/Contents/Resources/lib/python/xpra/gtk/notifier.py:184: DeprecationWarning: Gtk.Misc.set_padding is deprecated
  self.header.set_padding(3, 3)
/Applications/Xpra.app/Contents/Resources/lib/python/xpra/gtk/notifier.py:185: DeprecationWarning: Gtk.Misc.set_alignment is deprecated
  self.header.set_alignment(0, 0)
/Applications/Xpra.app/Contents/Resources/lib/python/xpra/gtk/notifier.py:226: DeprecationWarning: Gtk.Widget.modify_bg is deprecated
  self.modify_bg(Gtk.StateType.NORMAL, stack.bg_color)
/Applications/Xpra.app/Contents/Resources/lib/python/xpra/gtk/notifier.py:302: DeprecationWarning: Gtk.Window.get_opacity is deprecated
  opacity = self.get_opacity()
2023-11-21 14:55:31,482 Warning: server connection failure:
2023-11-21 14:55:31,482  Connection failed: disconnected before the session could be established
2023-11-21 14:55:31,482  connection error
2023-11-21 14:55:31,482  client failed to specify any supported encodings

To Reproduce
Steps to reproduce the behavior:
Client command: xpra start ssh://<user>@<server> --start-child=xterm

System Information (please complete the following information):

• Server OS: Ubuntu 20.04.6 LTS
• Client OS: macOS 14.1.1 BuildVersion: 23B2082
• Xpra Server Version: xpra v4.4.6-r29
• Xpra Client Version: arm64 beta PKG xpra v6.0-r34709 (g5a97fac04) beta

[totaam]

ImportError: dlopen(/Applications/Xpra.app/Contents/Resources/lib/python/lib-dynload/objc/_objc.so, 0x0002): symbol not found in flat namespace '_ffi_find_closure_for_code_np'

Looks like Xpra-org/gtk-osx-build#27
And a duplicate of #4017

I don't have the hardware to test.