Thread:Project:Support desk/Please help... Cannot contact the database server/reply

This is an issue of your configuration :) Please check, if the username and password of your database user (which must have access to the database you want to use) is written correctly and is valid.

The error "Access denied for user 'username'@'hostname'" is caused by incorrect credentials. From your error message I see that you are using the MySQL username "wikiuser". And I see that you are not using a password. Please make sure that you are using the correct username and password!

Since you say that you recently changed the password, my guess is that something got broken in that line in LocalSettings.php, where you have defined the password: Maybe this line is commented out or maybe the variable name is missspelled or something like that.