---
title: tcpi_tfo_cookie_req
framework: Kernel
role: symbol
role_heading: Instance Property
platforms: [macOS 10.11+]
path: kernel/tcp_connection_info/1561981-tcpi_tfo_cookie_req
---

# tcpi_tfo_cookie_req

## Declaration

```occ
u_int32_t tcpi_tfo_cookie_req:1;
```