NGX_ENETUNREACH  1050 core/ngx_connection.c         || err == NGX_ENETUNREACH
NGX_ENETUNREACH   149 event/ngx_event_connect.c                 || err == NGX_ENETUNREACH
NGX_ENETUNREACH  1289 event/ngx_event_openssl.c             || err == NGX_ENETUNREACH