I can't see a problem with your cookie settings, if the problem is only with you try another browser and or clear the cookies in your browser. What are you actually doing when you get logged out?
i m using IE9 And Chorme and same problem in both browser
also one more thing my both website are on same hosting company and problem only in this site
not only in this site i face same problem on phpbb.com but normally i m clicking remeber me and its work fine and when i m using my friends website which is phpbb based same problem i m facing
Sorry, I can see a problem with your cookie settings now. Your cookie domain is showing phpbburdu.com it should be .phpbburdu.com note the leading dot.