How to keep the session logged between different subdomains

Legacy Knowledge Base

Published Jul. 2, 2025

How to keep the session logged between different subdomains

Written By

Rodrigo Mier

Legacy Article

You are viewing an article from our legacy "FastTrack" publication program, made available for informational purposes. Articles in this program were published without a requirement for independent editing or verification and are provided"as is" without guarantee.

Before using any information from this article, independently verify its suitability for your situation and project.

Issue

You need to logging each time you enter in each site even sub domines of the same domain.
To keep de same session across different sites that are subdomains of the same domain. For example siteA.example.com and siteB.example.com

Environment

Portal 6.2
DXP 7.0
DXP 7.1
DXP 7.2
DXP 7.3
DXP 7.4

Resolution

To keep the same session between subdomains, the domain has to be defined in the session cookie with the following portal property:
```
session.cookie.domain=example.com
```
If you use tomcat, you have to modify one extra property
```
session.cookie.use.full.hostname[tomcat]=false
```

In addition, the domain must be defined in the context of the application server.
- In this example, with Tomcat you can define it in their context.xml file with the following parameter:
```
<Context sessionCookiePath="/" sessionCookieDomain="example.com">
```