diff --git a/docs/host-your-own.md b/docs/host-your-own.md
index 3e4cba6..603c132 100644
--- a/docs/host-your-own.md
+++ b/docs/host-your-own.md
@@ -402,10 +402,12 @@ Now point your browser to `http://localhost:8080`.
 # Coturn
 ## docker-compose
 
-- copy `docker-compose-coturn_example.yml` to `docker-compose-coturn.yml`
+- copy your ssl-certificates and privkey to `./letsencrypt` and `chown -R nobody:nogroup ./letsencrypt`
+- create a dh-params file with `openssl dhparam -out coturn-dhparams.pem 4096`
 - copy `rtc_config_example-coturn.json` to `rtc_config.json`
 - copy `turnserver_example.conf` to `turnserver.conf`
-- change <DOMAIN> in all three files to the domain, where your pairdrop is running
+- change <DOMAIN> in all 2 files to the domain, where your pairdrop is running
+- setup another domain <TURN-DOMAIN> for the turn-server if you want coturn listening on port 443 too. (Only then, it is needed)
 - change user and password for turn-server in `turnserver.conf` and `rtc-config.json`
 - To start the container including coturn run `docker-compose -f docker-compose-coturn.yml up -d`
 - To restart the container including coturn run `docker-compose -f docker-compose-coturn.yml restart`
@@ -417,6 +419,44 @@ To run PairDrop including its own coturn-server you need to punch holes in the f
 - 5349 tcp/udp
 - 10000:20000 tcp/udp
 
+## Coturn listens also on port 443
+### nginx
+If you want coturn listening von port 443, to avoid firewall-problems, you have to create a ssl-stream-redirection. Because nginx is 
+listening on port 443 to serve pairdrop (and all other websites on this host) ssl-secured. 
+
+Create a file `/etc/nginx/modules-available/coturn-stream.conf` and link it to `/etc/nginx/modules-enabled/90-coturn-stream.conf`
+Content:
+```
+stream {
+    map $ssl_preread_server_name $name {
+        <TURN-DOMAIN>           turn_server;
+        default                 url_backend;
+    }
+
+    upstream url_backend {
+        server 127.0.0.1:4444;
+    }
+
+    upstream turn_server {
+        server <IP-ADDRESS>:5349;
+    }
+
+    server {
+        listen 443;
+        listen 443 udp;
+        listen [::]:443;
+        listen [::]:443 udp;
+        ssl_preread on;
+        proxy_pass $name;
+        proxy_buffer_size 10m;
+    }
+}
+```
+And then you have to change in EVERY site-config EVERY https-listening port from 443 to 4444.
+Test and reload nginx `nginx -t && nginx -s reload`
+
+Now your websites should be availeable again, and coturn also listens on <TURN-DOMAIN>:443. The stream for coturn is redirected to <IP-ADDRESS>:5349. 
+
 ## Testing PWA related features
 PWAs require that the app is served under a correctly set up and trusted TLS endpoint.