SPDY Security transport inadequate

ERR_SPDY_INADEQUATE_TRANSPORT_SECURITY

Hello, one of my sites is giving this error ERR_SPDY_INADEQUATE_TRANSPORT_SECURITY,
here in the forum the solution to tidy up in ee3, which is in the way nano /var/www/yourdomain.com/conf/nginx/ssl.conf
and on ee4 how would it be?