Cannot Log in to the System

Hi,
   I dont know what happened. Actually I think I do !!! I clicked on LDAP Security thing under the system settings and when I restarted my machine it doesnt let me log in to the system now. I m using the root username and it keeps poping up this dialoge box that says "Cannot Authenticate". How can I fix this???
AdilKAsked:
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RahmathCommented:
You just boot in to the single user mode.after that issue the command "authconfig". this is a text based tool. check out the "Use LDAP" and press the -Next- button. then checkout the "Use LDAP Authentication" also. then just reboot the system and log in to yhe system.
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