Verifique a conexão! erro!

Warning: mysql_query() [function.mysql-query]: Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2) in /home/henriq/public_html/leisaprovadas.php on line 27

Warning: mysql_query() [function.mysql-query]: A link to the server could not be established in /home/henriq/public_html/leisaprovadas.php on line 27

Warning: mysql_query() [function.mysql-query]: Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2) in /home/henriq/public_html/leisaprovadas.php on line 28

Warning: mysql_query() [function.mysql-query]: A link to the server could not be established in /home/henriq/public_html/leisaprovadas.php on line 28

Warning: mysql_num_rows(): supplied argument is not a valid MySQL result resource in /home/henriq/public_html/leisaprovadas.php on line 30