Signing off from forums keeps the user logged in at warframe.com and prevents you from login back in to forums.

[-Zr-Scroll]

I was logged in earlier today, but logged out. Left the browser open as I was doing other stuff too. Few hours later I wanted to log in again. When I clicked "Existing user, sign in" button I got redirected to warframe.com frontpage with logged in status, able to do all the stuff I'm supposed to while logged in. The weird part is that as I tried to open the forums (regardless of the approach) the site claimed that I wasn't logged in. And when I tried to 'sign in' I got always redirected to warframe.com instead of login credential for forums.warframe.com.

The only way I was able to login back to forums was to sign out from warframe.com

[-Zr-Scroll]

My browser does that automatically every time I close it. I see it more as a security issue/miscommunications between  different parts of warframe login systems in websites