We have made in joomla 2.5 a website_slave with multisites that has in common with master the DB with users. I try to use Multisites Single Sign IN for domains which is set appropriately between websites and I cannot do it. Its happening like this:

master: ssidomain_login=false:/ssi_domain _logout=false
slave: ssidomain_login = true; / ssi_domain_logout = true;

If i log in with master, I cannot log in automatic on slave or otherwise.

If I am logged in on master and on slave but I log out from master I log out on slave and otherwise.

If you have a "false" on a website, this mean that you didn't correctly setup the parameters of the plugin.

You must have "true" for all the websites.

See also the user manual to enable the debug mode to help you get more info.

Verify also the "secret" value and do not put any space between the equal (=) and the value.

The situation is complicated and I dont see where the problem is. What happens: If I am logged on both websites: Master and Slave and I logout from one, it logouts me automatically from the other one. If I want to login in one of the websites, it doesnt login me automatically on the other website.

Master:
ssi_domain_logout = true;
ssidomain_login = false;

Slave:
ssi_domain_logout = true;
ssidomain_login = true;

Joomla! 2.5.6
Template GavickPro The World News II 2.11
Multisites Version 1.2.84
Patches definition Version 1.2.81

The issue is located on the master that return a SSIDomain_login = false.

That let me suppose that the secret value is not correct or perhaps a missing WWW in the URL.
The secret value is the one present in the joomla global configuration (configuration.php)