[Typo3] Why does TYPO3 kick out backend users?

[Robert Markula]

Jerker (Eric) Helander wrote:
> Hi,
> 
> I'm using typo3 3.6.2, winxp sp2 and IE6 and TYPO3 always kicks me out from
> the backend after a few minutes, whether I've made any changes doesn't
> matter. After a few minutes when I click any link I get the "sorry no user
> logged on, cannot proceed then".
> 
> It happens _only_ on one of my new computers with the above config. I have
> tried to allow all cookies but it doesn't help.
> 
> 
> Kind regards

Does it happen with other browsers than IE? Might be a cookie-related 
problem.
What kind of internet connection do you have?
Do you have any of the "restrict to IP address"/IP-Lock-features turned on?

Regards,
Ro