gupnp-av-cp fails to set volume of Sony Bravia on LAN through wi-fi

[kenn]

Package: gupnp-tools
Version: 0.10.2-1build1
Priority: optional
Section: universe/net
Origin: Ubuntu

I am running Ubuntu 22.04 Mate. I use `gupnp-av-cp` from `gupnp-tools` package. It controls smart tvs via LAN. It works OK on Ubuntu 20.04 and earlier versions.

It detects Sony Bravia on LAN but fails to set volume, etc. via `gupnp-av-cp` gui.

UPNP setting in modem is on.

I found the following warning in `~/.xsession-errors`:

     ** (gupnp-av-cp:390810): WARNING **: 19:58:41.447: Failed to get sink protocol info from media renderer 'uuid:00000000-0000-1010-8000-F0BF97C2CB09':Forbidden

I noticed that `gupnp-av-cp` process opens `sh` process:

sh -c /usr/lib/x86_64-linux-gnu/libproxy/0.4.17/pxgsettings org.gnome.system.proxy org.gnome.system.proxy.http org.gnome.system.proxy.https org.gnome.system.proxy.ftp org.gnome.system.proxy.socks

    Security Context unconfined
    Command Line /fusr/lib/x86_64-linux-gnu/libproxy/0.4.17/pxgsettings org.gnome.system.proxy org.gnome.system.proxy.http org.gnome.system.proxy-https org.gnome.system.proxy.ftp org.gnome.system.proxy.socks

    Waiting Channel do_poll.constprop.0
    ControlGroup /fuserslice/user-1000.slice/session-c3.scope ()