Description:
------------
yesterday morning was ok, but from yesterday afternoon,kept getting the error message: "Warning: ocilogon() [function.ocilogon]: _oci_open_server: Error while trying to retrieve text for error ORA-12162 in /www/orainclude.php on line 5"

from phpinfo()

oracle version: 10.1.0

operating system: Red Hat Linux 3.2.3-20

php version: 5.0.1

Reproduce code:
---------------
<?php
define ('dbuser','user');
define ('dbpwd', 'userpwd');
define ('dbname','');
$conn = OCILogon(dbuser, dbpwd);
?>

Expected result:
----------------
no error for ocilogon

Actual result:
--------------
the same ORA-12162 error