500 error only in privacy mode (chrome)

We have a NSS 5.2.3 (Docker Container) running in our kubernetes behind traefik with a certificate by lets encrypt.

We are testing the chess app (https://pheyvaer.github.io/solid-chess/) and it's working for a normal chrome session.

But in privacy mode or in Chromium, we will got the following error for the GET request https://localhost/inbox/ with status 500:
request to https://localhost/.well-known/openid-configuration failed, reason: unable to verify the first certificate

We tested also against inrupt.net and there is no problem.

We compared the requests and found out, that the cookie nssidp.sid is missing.

We tried some startup parameters, but with no effect.

We think that is not a specific NSS issue more like general purpose for proxying or security measures.

Bắt đầu bằng cách tái hiện yêu cầu GET tới https://localhost/inbox/ trong chế độ riêng tư của Chrome hoặc Chromium và so sánh với một phiên bình thường. Theo dõi lỗi xác minh chứng chỉ đối với /.well-known/openid-configuration và cookie nssidp.sid bị thiếu qua NSS, Docker, Kubernetes và Traefik; hoàn thành khi yêu cầu thành công mà không có lỗi 500.