---
title: Specifying the domain of the PF.PERSISTENT cookie
description: PingFederate identifies persistent authentication sessions by their respective PF.PERSISTENT cookie. You can specify the domain of this cookie.
component: pingfederate
version: 13.1
page_id: pingfederate:administrators_reference_guide:pf_specifying_domain_pf_persistent_cookie
canonical_url: https://docs.pingidentity.com/pingfederate/13.1/administrators_reference_guide/pf_specifying_domain_pf_persistent_cookie.html
llms_txt: https://docs.pingidentity.com/pingfederate/llms.txt
docs_for_agents: https://developer.pingidentity.com/build-with-ai/docs-for-agents.md
revdate: July 5, 2022
section_ids:
  about-this-task: About this task
  steps: Steps
  example: Example:
  result: Result
  related-links: Related links
---

# Specifying the domain of the PF.PERSISTENT cookie

PingFederate identifies persistent authentication sessions by their respective PF.PERSISTENT cookie. You can specify the domain of this cookie.

## About this task

By default, the PF.PERSISTENT cookie is set without domain information in the HTTP header.

`Set-Cookie: PF.PERSISTENT=UoBlPlf16V2oYAEPot2DnpUOXxitK7au;Path=/;Expires=Sat, 06-Nov-2021 00:48:08 GMT;Max-Age=94608000;Secure;HttpOnly`

You can configure PingFederate to return the Set-Cookie HTTP header with domain information, as needed.

## Steps

1. Edit the `<pf_install>/pingfederate/server/default/data/config-store/persistent-session-cookie-config.xml` file.

2. Modify the `cookie-domain` element.

   ### Example:

   `<c:item name="cookie-domain">.example.com</c:item>`

3. Save the change.

4. Restart PingFederate.

5. If you're running PingFederate in a clustered environment, perform the preceding steps on the console node. Then go to **System > Server > Cluster Management** and click **Replicate Configuration**.

## Result

After you activate this change, PingFederate includes domain information in its Set-Cookie HTTP header.

`Set-Cookie: PF.PERSISTENT=tOYwPM7VFMeluUyeu0EKQLL0DCJyVOqG;Path=/;Domain=.example.com;Expires=Sat, 06-Nov-2021 01:00:34 GMT;Max-Age=94608000;Secure;HttpOnly`

## Related links

* [Sessions](pf_sessions.html)