Customer&Admin Login Fail

[cristaltech]

I cannot login to the admin panel, customers can't login in the shop, resend password fail.

It always end up on the login page on the admin, and the error given is that the account does not exist for the clients.

I have reloaded my last backup of MySql.

I have requested my datacentre to look if there is a error on their side. I can also log in fine into Joomla and other sites on the same domain.

I experience the problem only with Zen.

Anybody got another ideas here ???

[cristaltech]

The site is www.cristaltech.co.za