Hi, I had some difficulties getting Siremis 5.3 to run under Debian 11 Bullseye. It turned out that the problem was the creation of the Siremis socket: <UnixSockLocal name="unixsocklocal" address="/run/siremis/siremis_rpc.sock" timeout="3.0"/> There is a warning in siremisJRCommands.xml that points out that systemd has to be reconfigured as sockets in /tmp are no longer shared (PrivateTmp setting). By the same token, /run/siremis/siremis_rpc.sock cannot be created as the httpd server is not allowed to write to /run, i.e. it can neither create the socket nor the siremis directory. The permanent creation of the siremis directory with suitable access rights is also not possible, since /run is mounted as tmpfs in the default configuration. At least the directory has to be created at boot time, which can be done with a small helper service. This is working for me (siremis-helper.service): [Unit] Description=Siremis Helper Service After=network.target [Service] Type=oneshot ExecStartPre=/usr/bin/mkdir /var/run/siremis ExecStart=/usr/bin/chown www-data:www-data /var/run/siremis [Install] WantedBy=multi-user.target It is enabled the usual way with systemctl "systemctl start --now siremis-helper". Siremis now works with jsonrpc commands and the procedure would mean that installing Siremis on a newer Debian system would definitely require some attention. Does anyone have any objections to the above procedure?