Sessions problem

Hello people out there! I've experienced a curly problem with Linux 2.4.16, Apache 1.3.9 & PHP 4.0.6 (Slackware 8). I use a session variable ($login) to manage the authentication to a web administration interface: every page begins with a simple test which checks if $login is stored in session. If not, it prompts an error message. <? session_start(); if (!session_is_registered("login")) { die("Error: you must log in."); } // The page goes here... ?> Sometimes (I wasn't able to find out any reproducible condition) the interface kicks off the user: the sessioned variable is lost. The most amazing thing is that I got no problems with 4.0.3pl1 on Linux 2.4.18 (Debian potato). Anyone of you can tell me the deeply hidden reasons? Thanks. -- ####################################### dott. Francesco Chicchiriccò AX Digital Systems Via del mare 85/A 00040 Pomezia (RM) E-mail francesco.chicchiricco@axnet.it Phone +39069180291 FAX +39069123658 Home http://chicchiricco.monrif.net #######################################