Hi.
I've installed the cron job in the server, but users stay connected even close the browser for more than 30 minutes.
Thanks
Did you check Cron Jobs using SSH? Do your members receive emails sent from your website? Are you 100% sure that you set up Cron properly? I am asking because mainly Cron is the only reason why members are staying online.
what host are you with as this may help in determining the cron syntax.
the /dev/null looks strange. I dont have that on mine.