Thread:Project:Support desk/Login Error: Cookies Disabled

Hi,

After a new installation of mediawiki (mw), I cannot log in to my mw installation. Every time I do, I get the error

I've searched everything I can possibly find on this topic, and what little solutions there are didn't work.
 * My php.ini file places all my sess_ files in the  directory with a   mask
 * is owned by the user:group my php runs with (in my case, www-data:www-data)
 * My php.ini has  in it
 * I tried setting  in LocalSettings.php, which did nothing
 * I have put  in LocalSettings.php, made the directory within the mw installation, and set the permissions to 777 (a remarkably insecure suggested fix, I might add)
 * I have setup a debug log to check the HTTP Headers; nothing seems amiss or out of place

Nothing has made any change. The sess_ files are created and stored just fine with the proper permissions (0600, as mentioned) in the proper directory for php to read them, but for some reason mediawiki (mw) will not accept them. Any help will be much appreciated. Per the Special:Version page of my mw installation, my setup is running:

Ubuntu Server 14.04 LTS

MediaWiki 1.24.2

PHP 5.5.9-1ubuntu4.9 (apache2handler)

MySQL 5.5.43-0ubuntu0.14.04.1

If it makes a difference, my hostname is with Google domains and I'm running behind a router with Asuswrt-merlin and using nginx.

Thanks!