How to use login sessions in Typo3 multiple subdomains?

Question

I am using version 8 of TYPO3 and I ask your help to know if it is possible to use the login session of a domain in another subdomain, within the same installation? For example, log in to www.example.com/login and use the session on a.example.com

Thanks.

Answer 1

You have to set the correct cookieDomain.
This example is for your suggested behaviour:

$GLOBALS['TYPO3_CONF_VARS']['FE']['cookieDomain'] = '.example.com';

You can set this with FE for frontend only, BE for backend only and SYS for the general behaviour (which will be overwritten by FE or BE).