Hi, How do you run postgresql? Via docker as well? If so you should make your postgres container and tigase container use the same dedicated network (see https://github.com/tigase/tigase-xmpp-server-docker/#dedicated-network) and then reference postgres via container name (which is also it's hostname within dedicated network)

I have postgres installed by brew install postgresql

I would recommend switching to one deployed in docker as well - makes maintenance easier, especially if your other tools also rely on docker. As for your use-case, accessing host services from within docker is somewhat tricky, but possible, see https://stackoverflow.com/questions/31324981/how-to-access-host-port-from-docker-container#43541732. In a nutshell: add --add-host=host.docker.internal:host-gateway to your docker run command and then in the installer use host.docker.internal for postgres database.

Alternatively, you can run Tigase without docker - simply download latest distribution package from https://github.com/tigase/tigase-server/releases/tag/tigase-server-8.3.0, extract it and in the directory run ./scripts/tigase.sh start etc/tigase.conf (at least JDK17 has to be installed)