Locked out of the forum: Error: misconfigured csrf

[JJSagan]

Hello,

I have a forum hosted on AWS.
The code is synced to master.
I am using nginx on the same server, with SSL.
Furthermore I am using Redis (provided by AWS).

As of today's noon, when I browse the forum's address, I get ERR_TOO_MANY_REDIRECTS on the client side.
Looking at the server logs I see "Error: misconfigured csrf".

Let me assure you that the config file was not changed. Furthermore Redis is up and running (I can browse the database via Redis desktop manager).

I tried resolving it till now (removing all plugins, removing nginx, removing FW, removing SSL, etc. etc.). In addition I changed the config file to:

Website Hosting - Mysite.com

https...
www.mysite.com (the original value).
127.0.0.1:4567 (nginx forwards to that address)

Nada... Its frustrating...

Any idea ?
Thank you in advance!
JJ.