After some days I’m still not able to start meetings with audio or video. Installation was done on a Strato V-Server with 4 CPUs and 8 GB RAM. OS is Debian 9. Only difference from Quick Install was that I did nginx (full) and certbot installation and certificate creation in advance, because script did not work.
In the beginning I wasn’t even able to connect to a meeting and start a chat. I could start same meeting name on different clients but could not see each other and not even my own chat input. I realized that I need systemd settings described under “Advanced configuration” even for this.
No I can start meetings, connect from other (desktop) clients and use chat but screen is still dark and I can only see my own video. Connection from Android client does not work at all.
What I found in further investigations is entry in prosody.err that module mod_storage_memory.lua is missing. And therefore maybe more is missing …
Ports are open, no NAT.