access denied error for cloned drupal web server

I cloned a web server with drapal CMS to a new server. After I finished this, I couldn't use the same admin's user name and password to open the page. It gave me "Access Denied" error. I was wondering if the database and web server is the same, why the account and privilege is different?

Please advise how to trouble shoot for this, thanks.

OS version: RedHat v6.6, .  This latest version has the patches for SSL, openssl, bash, etc.
Jason YuAsked:
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oliverpoldenConnect With a Mentor Commented:
Please can you outline exactly the steps you took to clone the website.
Jason YuAuthor Commented:
I've requested that this question be deleted for the following reason:

Got it resolved by myself.
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