---
title: client.socket.tcpi_rcv_ssthresh
summary: null
url: >-
  https://www.fastly.com/documentation/reference/vcl/variables/client-connection/client-socket-tcpi-rcv-ssthresh
---

**Type:** INTEGER  
**Access:** read-only

**Available in:** recv, deliver, log, error

The maximum number of bytes currently advertised as the TCP
receive window (RWIN) to the client. The actual RWIN is reduced by the
amount of data currently buffered in the kernel.