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In order for the fix to work, you MUST enter the Cookie Domain into Joomla Global Configuration.
It's not anything magical, and it isn't hard to know what to put there. If your website is "
" - you should use either ".
" or ".example.com". The first is more restrictive (and the Joomla default), the second allows you to share cookies between all of your example.com websites. If you don't know anything about #2 - use #1.
Note, both of those example.com values are preceded by a "." (period)