I have finally got my master, slave and share slave all working but the user sessions is not being carried over form sub domain to sub domain user still need to login every time.

I looked at the database and the last login get updated for all databases no matter where the user logged in but the cookie is not carrying over i guess need help.

I have my own sever using cpanel so if its something I can fix in there let me know.

First you have to check that you have effectivelly shared the users and session table between your website.
You can use the JMS tools to check it.
Use the table panel.

Perhaps you can also check if your browser accept the cookies.

Can you relogin with the same user and password between the different domain (just to check that you have correctly shared the information when you have created the website).
I remember you that this is a decision that must be taken when you create the website and that can not modified later.

You can also check the /multisites/config_multisites.php to verify that it contains the cookies_domains parameters for your different sub-domain (slave sites).

If you can re-login, you can also test the behavior when you as the login form to "remember" the login. This normally write information in the cookies.
Just to see if the cookies are correctly managed.

If cookies and the re-login is working, this is perhaps a problem somewhere in the configuration of the server that would not accept to share the session ID between sub-domain.

i have done what you have told me to do my findings are as follows.

I have no problem login, in both sites. the remember function works no problem. hower ever i have looked at all my multisites folder in each of the sites including the master and i could not find no parameter called cookies_domain in any of the folder. None in file config_multisites.php and not in comfig_templates.php

i have also investigated suhosin extension for php which is installed on my server and disable the features that cause with type of is as instructed by many developer on a few forum still no luck.

If you don't find the "cookie_domains" in the config_multisites.php, just open and resave a slave site in the JMS manage site.
This will rebuild the config_multisites.php
If the cookie are still not present in the file, then check that all the domain defined in the websites are correctly written.

The expected result is to have cookie_domains parameter in the config_multisites.php file present in the /multisites directory.
Without this information, PHP will not share the session ID between the sub-domains.

save it. tried it many time still nothing