Hi,

> How can i use https logins for the captive portal?

click the HTTPS button on the captive portal control page

> How can i create a https certificate?

read the docs. eg check out the bottom of:

http://www.m0n0.ch/wall/notes.php

(this could be in FAQ to make it 'easier' to find
 
> I also marked the option "enable logout popup window" but i never get that
> popup.
> Am i the only one?

does your browser allow popups? probably not these days. firefox
wont by default, any up to date patched IE6 wont. IE7 wont, Mozilla
wont, Safari wont etc
 
alan