[cflsystems]

Since 4.5.5 XC uses some security features that make everyone's life a pain in situations like this or an upgrade, and by everyone I mean an admin, hackers always find a way right.... These security features are in config.php, tied to an ip address, the keys generated are also tied to specific ip and/or server configuration. If you move site like this it is very likely all admin logins to stop working. You can recover password if it works, but probably best to just disable all these security features in config.php - with value of false - so the value in the db are not checked against. Then you should be able to login to admin

To get it back to work properly with the security features on you will have to run "blowfish regeneration" from admin maintenance page - this is the only way to regenerate the new keys