Dell IDRAC6 User Manual page 202

13 Close the Registry Editor window. You can now log in to iDRAC using
SSO.
If you have enabled SSO for iDRAC and you are using Internet Explorer to
log in to iDRAC, SSO fails and you are prompted to enter your user name
and password. How do I resolve this?
Ensure that the iDRAC IP address is listed in the ToolsInternet
OptionsSecurityTrusted sites. If it is not listed, SSO fails and you are
prompted to enter your user name and password. Click Cancel and proceed.
202
Configuring iDRAC6 for Single Sign-On or Smart Card Login