QUOTE(Glenn @ Oct 31 2007, 12:20 AM)

For this forum, the cookie you require is forum.piriform.com but this appears to be one of those cookies that toggles back and forth between [1] and [2]. That is, when you log in, it is <user>@forum.piriform[1].txt but as soon as you do something on the site, it becomes <user>@forum.piriform[2].txt (this is the naming format displayed in the Cookies folder).
Just 'forum.piriform.com' works fine for me.