Failed to convert certificate chain from PEM to DER error on Kubernetes

Issue

SSL on the Nginx Ingress Controller is not working
Nginx logs are showing the error:

[error] 40#40: *1406 [lua] certificate.lua:77: call(): failed to convert certificate chain from PEM to DER: PEM_read_bio_X509_AUX() failed

Environment

CloudBees CI (CloudBees Core)
CloudBees CI (CloudBees Core) on modern cloud platforms - Managed controller
CloudBees CI (CloudBees Core) on modern cloud platforms - Operations Center
kubernetes/ingress-nginx: NGINX Ingress Controller for Kubernetes v0.24.1/v0.24.0

Resolution

This error is caused by the bug reported here: Sharing TLS config between ingresses · Issue #4106 · kubernetes/ingress-nginx

It can be fixed by upgrading the Nginx Ingress Controller to version 0.25.0 or higher. Alternatively, you can downgrade to version 0.23.0.

This article is part of our Knowledge Base and is provided for guidance-based purposes only. The solutions or workarounds described here are not officially supported by CloudBees and may not be applicable in all environments. Use at your own discretion, and test changes in a safe environment before applying them to production systems.