documentation:2.1:cda

Cross Domain Authentication

Go in Manager, General Parameters » Cookies » Multiple domains and set to On.

To use this feature only locally, edit lemonldap-ng.ini in section [all]:

[all]
cda = 1
If your handler is being served by Nginx, you have to uncomment the following lines in your nginx configuration file:
# If CDA is used, uncomment this 
auth_request_set $cookie_value $upstream_http_set_cookie; 
add_header Set-Cookie $cookie_value;

Choose "CDA" as type for each virtualHost concerned by CDA (ie not in main domain).