---
title: tcpi_tfo_cookie_invalid
framework: Kernel
role: symbol
role_heading: Instance Property
platforms: [macOS 13.0+]
path: kernel/tcp_info/3944486-tcpi_tfo_cookie_invalid
---

# tcpi_tfo_cookie_invalid

## Declaration

```occ
u_int16_t tcpi_tfo_cookie_invalid:1;
```