Session-problems in linux

Hi everyone, I can't get the sessions working in linux. I changed: /usr/local/lib/php.ini session.auto_start = 1 so when the browser go to the page, a cookie is recieved. In the /tmp-dir a file is created and everything looks great. However, when I register a variable and set it to a value, only the name, not the value is stored. I've tried to store strings, arrays, integers but no luck. I do: session_register("foo"); $foo="Great day"; and the file will only contain ":foo|" with no accompanying value. I'm really stuck here, and everything works fine in windows but not in RH7.1. I would be very greatful for any hints here. /t eriksson