Question : IE-SSO supported with IronPort S160?

I've activated LDAP on a IronPort S160, but when users are starting IE they have to authenticate (very annoying, would prefer single sign on), see image. I've tried to add the server URL to a security zone in IE without any luck. Any good ideas?

Thanks!

Attachments:

ie-sso-ironports160.png (20 KB) (File Type Details) 

IronPort authentication in IE

Answer : IE-SSO supported with IronPort S160?

It's possible, however, SSO is only avaible when deployed with NTLM.

http://www.cisco.com/en/US/solutions/collateral/ns340/ns414/ns742/ns982/sba_webSec_dg.pdf