SSO in Cognos

[theBIguy]

Hi guys,

i am new this cognos DB.i work for an MNC as a Cognos Admin.
ours is hybrid achitecture. Cognos gateway is installed on linux machine and apache2.0 is our websever.

recently the SSO ability has vanished .please suggest me where to look and what to do for bringing back the SSO.

Thanks

[theBIguy]

Forgot to mention ...we have siteminder also running