mate 18.04.1 (or newer) xserver won't open caja on local machine

[N0rbert]

Expected behaviour

• Caja is shown on remote (client) screen with window title folder (on hostname)

Actual behaviour

• Caja is not shown on remote (client) screen, but launches on server locally.

Note: this works normally if server runs Ubuntu MATE 16.04 LTS, but fails with 18.04 LTS and newer.

Steps to reproduce the behaviour

1. Have installed Ubuntu MATE 18.04 LTS (you know its hostname and IP - i.e. 192.168.1.162)

2. Install SSH server on Ubuntu MATE 18.04 LTS

3. Open terminal on other remote system (client) and execute command to run Caja over X forwarding:

   ssh -X user@192.168.1.162 caja

MATE general version

1.20.2

Package version

1.20.2-4ubuntu1

Linux Distribution

Ubuntu MATE 18.04 LTS and newer versions

Link to downstream report of your Distribution

https://pad.lv/1815318

[N0rbert]

Ubuntu MATE 20.10 is affected too.

[lukefromdc]

That might be the ssh server configuration, as "xforwarding" is a non-default option for security reasons last I looked. Still, that should control whether any X application can connect, not just Caja. Check some others to determine if this is a caja problem or an ssh server configuration issue

[N0rbert]

Still happens on latest Ubuntu MATE 22.04 LTS beta.