Cron task

Hello,

On my installation i using de cron task (debian with wget) but for test i going to the url with my navigator and i've a white page with this error in my log apache (access.log)

83.152.xxx.xxx - - [01/Aug/2012:08:27:35 +0200] "GET /elgg/pg/cron/hourly HTTP/1.1" 301 447 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:14.0) Gecko/20100101 Firefox/14.0.1"
83.152.xxx.xxx - - [01/Aug/2012:08:27:36 +0200] "GET /elgg/cron/hourly HTTP/1.1" 200 403 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:14.0) Gecko/20100101 Firefox/14.0.1"