barrierc loses connection with 'WARNING: failed to connect to server: invalid message from server' os x 10.6.8 client when key held down

[GrumpyDisabledMan]

What happened?

barrierc loses connection with 'WARNING: failed to connect to server: invalid message from server' os x 10.6.8 client when any key is held down for repeat.

Version

v2.4.0

Git commit hash (if applicable)

No response

If applicable, where did you install Barrier from?

macports

What OSes are you seeing the problem on? (Check all that apply)

macOS

What OS versions are you using?

Server macOS 15.7.3
Client OS X 10.6.8

Relevant log output

Mac-Mans-iMac:~ macman$ barrierc --version
barrierc 2.4.0-release
Protocol version 1.6
Copyright (C) 2018 Debauchee Open Source Group
Copyright (C) 2012-2016 Symless Ltd.
Copyright (C) 2008-2014 Nick Bolton
Copyright (C) 2002-2014 Chris Schoeneman


Mac-Mans-iMac:V1.0a macman$ sudo barrierc --yscroll 120 --enable-drag-drop --disable-crypto --no-daemon --name Mac-Mans-iMac --restart 192.168.88.10:24800
[2026-04-29T10:24:22] INFO: drag and drop enabled
[2026-04-29T10:24:22] NOTE: started client
[2026-04-29T10:24:22] NOTE: connecting to '192.168.88.10': 192.168.88.10:24800
[2026-04-29T10:24:22] WARNING: cursor may not be visible
connected to server
[2026-04-29T10:24:34] INFO: entering screen
[2026-04-29T10:24:34] WARNING: cursor may not be visible
[2026-04-29T10:24:34] INFO: clipboard was updated
[2026-04-29T10:24:34] INFO: clipboard was updated
[2026-04-29T10:24:42] INFO: found key in group 0
[2026-04-29T10:24:47] ERROR: invalid message from server: 
[2026-04-29T10:24:47] INFO: leaving screen
[2026-04-29T10:24:47] WARNING: cursor may not be visible
[2026-04-29T10:24:47] WARNING: cursor may not be visible
[2026-04-29T10:24:47] WARNING: failed to connect to server: invalid message from server
[2026-04-29T10:24:48] NOTE: connecting to '192.168.88.10': 192.168.88.10:24800
[2026-04-29T10:24:48] WARNING: cursor may not be visible
connected to server

Any other information

No response

[nbolton]

Barrier is no longer in development. Check out Deskflow (upstream) or Input Leap (fork).

https://github.com/deskflow/deskflow
https://github.com/input-leap/input-leap

If this is still an issue in those projects, we would appreciate a cross-post of this issue.

[GrumpyDisabledMan]

Hi, thanks for your reply.
Unfortunately, deskflow isn't available in macports for 10.6.8 and Input-Leap always fails to build.

I'll keep tinkering.

[sithlord48]

Nothing is stoping anyone from making a pr on deskflow (or macports) to add it. You are not gonna get updates from input-leap or barrier they are very much unmaintained at this point.

Edit:
10.6 is a bit old and deskflow would not be able to support it anyway since minimum for Qt6 iirc is mac os 12