Merhaba,
Plesk tarafında oluşan;
Misdirected Request
The client needs a new connection for this request as the requested host name does not match the Server Name Indication (SNI) in use for this connection.
hatasını SSH bağlanıp aşağıdaki kodu yazıp giderebilirsiniz.
echo -e "proxy_ssl_server_name on;\nproxy_ssl_name \$host;\nproxy_ssl_session_reuse off;" > /etc/nginx/conf.d/fixssl.conf && service nginx restart