Please also set cacertfile to chain.pemYou may also set certfile to cert.pem instead of fullchain.pemlistener.wss.external.keyfile = /etc/letsencrypt/live/xxxx.com/privkey.pemlistener.wss.external.certfile = /etc/letsencrypt/live/xxxx.com/cert.pemlistener.wss.external.cacertfile = /etc/letsencrypt/l……