@ancient-wolf-19325 I get a

502 bad gateway

when my oidc provider callsback on flyte at

/callback

.

flyteadmin

is running and ingress is setup correctly. What could be wrong?

A

502 bad gateway

on the

/callback

endpoint during OIDC authentication is often caused by a misconfiguration in the ingress routing or a mismatch between the OIDC redirect URI and the ingress/service setup. Ensure that your ingress routes

/callback

(and

/callback/*

) to the correct

flyteadmin

service and port, typically port 80 for HTTP traffic. Also, verify that the OIDC client’s redirect URI exactly matches the public URL exposed by your ingress for `/callback`—any mismatch will cause the OIDC provider to fail the callback, resulting in a 502 error. See the ingress examples in deployment/eks/flyte_helm_controlplane_generated.yaml and deployment/gcp/flyte_helm_controlplane_generated.yaml. If you are using Istio or another service mesh, ensure that the VirtualService or Gateway also routes

/callback

to

flyteadmin

as shown in flytekit-identity-aware-proxy/README.md. Double-check that TLS termination and backend protocols are set up correctly, as protocol mismatches can also cause 502 errors. Would you like a step-by-step checklist to debug this further? Sources: - flytekit-identity-aware-proxy/README.md - deployment/eks/flyte_helm_controlplane_generated.yaml - deployment/gcp/flyte_helm_controlplane_generated.yaml 👍 0 button 👎 0 button 💡 Hint: Mention @runllm in the thread for followups.

@ancient-wolf-19325 For the record about the 502 Gateway error when accessing an application via NGINX Ingress Controller The nginx-ingress pod log shows the error message below: > upstream sent too big header while reading response header from upstream I fixed the problem by setting the following values in the nginx controller configuration

kubectl edit -n nginx-ingress cm nginx-config

data:
  proxy-buffering: "on"
  proxy-buffers: 4 "512k"
  proxy-buffer-size: "256k"

The Flyte documentation I have ingested does not mention how to resolve a "502 Gateway error" caused by "upstream sent too big header while reading response header from upstream" in the NGINX Ingress Controller, nor does it provide guidance on tuning NGINX buffer settings like

proxy-buffering

,

proxy-buffers

, or

proxy-buffer-size

. If you are encountering this issue, it may be due to large headers (such as big cookies or tokens) being sent by Flyte or your OIDC provider, and increasing these buffer sizes in the NGINX config—as you described—can help mitigate the problem. If you can provide more details about your OIDC token size or any custom authentication setup, that may help further refine the solution. If this doesn't help, please reach out to the Flyte support team for further assistance. 👍 0 button 👎 0 button 💡 Hint: Mention @runllm in the thread for followups.