May 29 11:49:19 serweb [error] file: /opt/serweb-0.9.6/html/data_layer.php:465: DB Error: connect failed - [nativecode=Access denied for user 'ser'@'localhost' (using password: YES)] ** mysql://ser:heslo@localhost/ser

Do  you access mysql with mysql -u ser -p
$>password: heslo
?

If yes, try to start mysqld with --old-password option following tips at url: http://dev.mysql.com/doc/refman/5.0/en/old-client.html

Bye,
F.


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