---
name: "gnutls_anti_replay_set_window"
section: "3"
platform: "linux"
package: "gnutls"
version: "3.8.13-3"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/gnutls_anti_replay_set_window"
---

# gnutls\_anti\_replay\_set\_window(3)

API function

## NAME

gnutls\_anti\_replay\_set\_window - API function

## SYNOPSIS

**#include \<gnutls/gnutls.h\>**

**void gnutls\_anti\_replay\_set\_window(gnutls\_anti\_replay\_t** *anti\_replay***, unsigned int** *window***);**

## ARGUMENTS

- gnutls\_anti\_replay\_t anti\_replay

  is a **gnutls\_anti\_replay\_t** type.

- unsigned int window

  is the time window recording ClientHello, in milliseconds

## DESCRIPTION

Sets the time window used for ClientHello recording.  In order to protect against replay attacks, the server records ClientHello messages within this time period from the last update, and considers it a replay when a ClientHello outside of the period; if a ClientHello arrives within this period, the server checks the database and detects duplicates.

For the details of the algorithm, see RFC 8446, section 8.2.

## SINCE

3\.6.5

## REPORTING BUGS

Report bugs to \<bugs@gnutls.org\>.\
 Home page: https://www.gnutls.org

## COPYRIGHT

Copyright © 2001-2023 Free Software Foundation, Inc., and others.\
 Copying and distribution of this file, with or without modification, are permitted in any medium without royalty provided the copyright notice and this notice are preserved.

## SEE ALSO

The full documentation for **gnutls** is maintained as a Texinfo manual. If the /usr/share/doc/gnutls/ directory does not contain the HTML form visit

- https://www.gnutls.org/manual/