Dear Moshe I did switch off the seafile configuration and that means that the normal chat.mydomain.com works again with nginx.,
I did then do > sudo certbot --nginx and the sitechat.mydomain.com now runs on with SSL. So then I switch seafile conf on again --> Seafile works as always. AND mattermost on chat.mydomain.com works, but ONLY if I add https:// in front of the web address. So: chat.mydomain.com <-- does only work when seafile off (then redirects) http://chat.mydomain.com <-- does only work when seafile off (then redirects) https://chat.mydomain.com <-- works when seafile is on and/or off. Why does nginx not redirect the chat.mydomain.com to https? The new config for chat.mydomain.com is this. it got changed by certbot automatically. MATTERMOST: server 127.0.0.1:8065; } proxy_cache_path /var/cache/nginx levels=1:2 keys_zone=mattermost_cache:10m max_size=3g inactive=120m use_temp_path=off; server { server_name chat.mydomain.com; location ~/api/v[0-9]+/(users/)?websocket$ { proxy_set_header Upgrade $http_upgrade; proxy_set_header Connection "upgrade"; client_max_body_size 50M; proxy_set_header Host $http_host; proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; proxy_set_header X-Forwarded-Proto $scheme; proxy_set_header X-Frame-Options SAMEORIGIN; proxy_buffers 256 16k; proxy_buffer_size 16k; proxy_read_timeout 600s; proxy_pass http://backend; } location / { client_max_body_size 50M; proxy_set_header Connection ""; proxy_set_header Host $http_host; proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; proxy_set_header X-Forwarded-Proto $scheme; proxy_set_header X-Frame-Options SAMEORIGIN; proxy_buffers 256 16k; proxy_buffer_size 16k; proxy_read_timeout 600s; proxy_cache mattermost_cache; proxy_cache_revalidate on; proxy_cache_min_uses 2; proxy_cache_use_stale timeout; proxy_cache_lock on; proxy_pass http://backend; } listen 443 ssl; # managed by Certbot ssl_certificate /etc/letsencrypt/live/chat.mydomain.com/fullchain.pem; # managed by Certbot ssl_certificate_key /etc/letsencrypt/live/chat.mydomain.com/privkey.pem; # managed by Certbot include /etc/letsencrypt/options-ssl-nginx.conf; # managed by Certbot ssl_dhparam /etc/letsencrypt/ssl-dhparams.pem; # managed by Certbot } server { if ($host = chat.mydomain.com) { return 301 https://$host$request_uri; } # managed by Certbot listen 80; server_name chat.mydomain.com; return 404; # managed by Certbot Posted at Nginx Forum: https://forum.nginx.org/read.php?2,279794,279806#msg-279806 _______________________________________________ nginx mailing list nginx@nginx.org http://mailman.nginx.org/mailman/listinfo/nginx