NGX_ECONNREFUSED 1048 core/ngx_connection.c         || err == NGX_ECONNREFUSED
NGX_ECONNREFUSED  139 event/ngx_event_connect.c             if (err == NGX_ECONNREFUSED
NGX_ECONNREFUSED 1287 event/ngx_event_openssl.c             || err == NGX_ECONNREFUSED