API Key just shows a "-" (dash)

This probably isn’t of much help to you, but I also have the interface behind nginx and all is well on FF and Chrome.

But, I initially had repeated “Syncthing seems to be down” messages, until I adjusted some buffers and timeouts in my nginx config.

These are the relevant parts of my nginx config:

server {
  listen 443 ssl http2;
  listen [::]:443 ssl http2;
  server_name ...
  ssl_certificate ... etc
  location / {
      add_header Strict-Transport-Security "max-age=31536000";
      proxy_set_header X-Real-IP $remote_addr;
      proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
      proxy_buffers 32 4m;
      proxy_busy_buffers_size 25m;
      proxy_buffer_size 512k;
      proxy_read_timeout 600s;
      proxy_send_timeout 600s;
      proxy_http_version 1.1;
      proxy_max_temp_file_size 0;
      proxy_pass http://127.0.0.1:8384/;
  }
}