NGX_ECONNREFUSED 1251 src/core/ngx_connection.c         || err == NGX_ECONNREFUSED
NGX_ECONNREFUSED  129 src/event/ngx_event_connect.c             if (err == NGX_ECONNREFUSED
NGX_ECONNREFUSED 1880 src/event/ngx_event_openssl.c             || err == NGX_ECONNREFUSED