PHPBB integration problem

[leprakhauns]

When I try and login from one, it says I need to login to the other EG I want to login to the gallery and I hit login I then go to the phpbb login screen and login when I go back to my CMG it says I'm not logged in and I click login and it looks like it logs me out of phpbb and then on the bottom of the forum main page I need to log in and then I am logged into both.  I have set my cookies path in the phpbb configuration to "/"  and I used the wizard.  Also when I do get logged in and I try and log out from coppermine sometimes I get this error:
General Error

Invalid_session

And that is from the forum.  Othertimes if I hit log out from CPG it will take me to my forum page where I'm still logged in and I need to log out there too.  Any ideas on what I can do to change this?

[leprakhauns]

Oh I forgot  My website url is lepslair.com
My photo gallery is lepslair.com/photos (there's no link on my site yet I want to get everything working first)
My forum link is lepslair.com/forum

a test user name is lep and the test password is 12345678

[Nibbler]

www.lepslair.com is a different domain to lepslair.com. Either be consistant with your usage or set the cookie domain to .lepslair.com in your forum's config.

[leprakhauns]

Thank you that works now could you explain why I had to put .lepslair.com?