I've successfully integrate the Alfresco CE with my LDAP Server. But is it possible to make the /share and /alfresco in the CE connected using the SSO SPNEGO feature?
yes, please see <a href="http://docs.alfresco.com/4.2/concepts/auth-kerberos-intro.html">Configuring Kerberos</a> for details about this. Be aware that while Alfresco supports SPNEGO technically, it will only handle Kerberos via SPNEGO and not support fallback to NTLM.