Keep getting logged out

I sumbitted a topic here http://www.phpbb.com/community/viewtopic.php?f=46&t=1969015

And was told to come here.

Basically, I'm on eclipse internet. Using mozilla firefox 3.5.7 and I keep getting logged out. Tried in IE as well.

I deleted temp, cookies and did run

ipconfig /flush
ipconfig /release
ipconfig /renew

Even on another computer, still happened.

Happens like 3-4 mins when making a post, pm,etc.

Regards,
George.