502 without reasons

Zero Trust Access
1

We are using Cloudflare Access with Google as auth provider.

Some users experience 502 pages when the web application is making POST requests. Performing the same action in a new fresh Incognito windows works.

We KNOW that our server is not the problem as without Cloudflare Access we do not have these issues.

It is a plain Django admin site we are protecting with Cloudflare Access.

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2

Any ideas on the above? We are experiencing 502 for some users, and not for others, and also depending on what browser is used, and if in incognito or not. I understand that 502 should be returned if we really timeout, or something else happens, but the Host for sure does not error.