Internal Server Error

[Warning] mysql_connect() [<a href='function.mysql-connect'>function.mysql-connect</a>]: Unknown MySQL server host 'mysql.activimmo.be' (11004) (@line 22 in file D:\web_belgimmo\belgimmo2\www\protected\Common\GDataModule.php).

An internal error occurred while the Web server was handling your request. Please contact the webmaster to report this problem.

Thank you.