NGX_ENETUNREACH  1253 src/core/ngx_connection.c         || err == NGX_ENETUNREACH
NGX_ENETUNREACH   139 src/event/ngx_event_connect.c                 || err == NGX_ENETUNREACH
NGX_ENETUNREACH  1882 src/event/ngx_event_openssl.c             || err == NGX_ENETUNREACH