Session not work on server

[eluser]Unknown[/eluser]
I was having a similar problem today. I had a CI site that worked perfectly on localhost. When I moved it to a Ubuntu server that I had just set up at home the site looked like it was working, but when I tried to login I was losing all $_POST data and session info (both returned empty arrays).

After an embarrassingly long time I realized that I had not enabled mod_rewrite on the server. Once that was enabled the problem was solved.

Hope that will help someone who's having the same problem.