Websphere Global Security

Hi All,
 
Please someone can show me how to disable the Global Security settings of WAS 6.0 because
Our http://Server:2001/HttpAdmin http console shows following message & can’t be restart the above server
 
 
The WebSphere Application Server instance "default/server1" has been secured. To manage all aspects of this server click on the "Launch Administrative Console" and sign in with an authorized user.
 
 
Ok this is what I did; please correct me if I’m wrong
 
Then I logged into Websphere Administrative Console with UserName & Password , under Security tab, Clear check boxes (Enable Global Security & Enforce Java 2 Security)  but again a similar error occurred. 
 
Anyone else seen this and better yet know how to make it go away?
 
Thanks
Dhanu