Sudden HTTP 403 errors with Discourse Docker ("BAD CSRF")

[claas (Claas Aug.)]

Maybe this will fix it in 3.3.4?

FIX: Simplify nginx config change (#30383)

See also:

SSO broken after rebuild with stable v3.3.3

I suspect the issue here is not the DiscourseConnect security fix but rather the nginx change. On tests-passed we had to make a followup on Thursday because it was causing problems on some environments and another user on Github noted CSRF issues. I have a backport ready for that: https://github.com/discourse/discourse/pull/30410, it should be merged shortly (once someone in the team approves it, though it’s Sunday for most people). You’re welcome to give that branch a try with your SSO set up @…