session not working?

Login.php
-------------

i stored the value

PHP Code:

$_SESSION['logvalue']="89"; 


Redirect.php
---------------

PHP Code:

echo " -  - ". $_SESSION['logvalue']; 


This is working on local Apache server. but not working on PLESK and 000Webhost..?

Code:

A PHP Error was encountered
Severity: Notice
Message: Undefined index: logvalue

Thanks..