admin - error drupal after copy & paste folder, and same DB -

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i copied , pasted whole drupal content folder server localhost , dumped db localhost, admin user authentication credentials not working in localhost.

i reset admin password (update admin set pass = md5('newpassword') uid=1;)

also in watchdog table having message when try authenticate:

"session opened %name."

any ideas??

the error parameter $cookie_domain on file /sites/default/settings.php. working fine now


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