Database connection error.

A fatal error occurred Revive Adserver can't connect to the database. Because of this it isn't possible to use the administrator interface. The delivery of banners might also be affected. Possible reasons for the problem are: <ul> <li>The database server isn't functioning at the moment</li> <li>The location of the database server has changed</li> <li>The username or password used to contact the database server are not correct</li> <li>PHP has not loaded the MySQL Extension</li> </ul>