Cas and subdomais

[t.arrad at gmail.com]

Hi all,
On my portal architecture i have deployed cas server 3.1 with ldap and it work nicely on a unique domain "www.mydomain.com". Actually  i'm trying to add a new service on the portal "blogs" witch run on subdomain "blogs.mydomain.com". Can someone tell me how can i share authentication between the two subdomains "www and blogs".
Thanks for help.
Tarik
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