Subdomain drupal sites cannot read domain cookies [closed]

Question

I have set a cookie from domain (.example.co) and its .NET platform & reading those cookie from drupal site(test.example.co).

While retrieving it shows empty, I have used $_COOKIE.

This link suggests it is possible, also we are setting domain name while creating cookies? Is it possible to use while retrieving cookies?

Also i have found this link, is that interrelated?

Answer 1

You need to provide an appropriate value for $cookie_domain in settings.php.

e.g.

$cookie_domain = 'example.co';

That will allow you to set/retrieve cookies from example.co on foo.example.co, and vice versa.

Answer 2

In order to use other subdomains' cookies, you need to set both site's cookie domain to .example.com.

Answer 3

Thanks all for you reply,

Finally reason has been found, since there is an DOT(.) in the cookie name set. It cannot be retrieved.

https://harrybailey.com/2009/04/dots-arent-allowed-in-php-cookie-names/