We are facing the issue with https : Caused by: io.grpc.StatusRuntimeException: UNAVAILABLE: Failed ALPN negotiation: Unable to find compatible protocol
Also for reference, Same issue we are getting with/without adding keystore and truststore certificates.
while for http and localhost it is working fine with out any issues.
with java version : 21
ngnix version : v1.12.1
here is the complete ingress properties
kind: Ingress
apiVersion: networking.k8s.io/v1
metadata:
name: camunda-zeebe-gateway-grpc
namespace: pp-dev
uid: 6fcab0f2-abe2-4XXXX
resourceVersion: ‘35263055’
generation: 1
creationTimestamp: ‘2025-09-29T06:33:29Z’
labels:
app: camunda-platform
app.kubernetes.io/component: zeebe-gateway
app.kubernetes.io/instance: camunda
app.kubernetes.io/managed-by: Helm
app.kubernetes.io/name: camunda-platform
app.kubernetes.io/part-of: camunda-platform
app.kubernetes.io/version: 8.7.10
helm.sh/chart: camunda-platform-12.4.0
annotations:
ingress.kubernetes.io/rewrite-target: /
meta.helm.sh/release-name: camunda
meta.helm.sh/release-namespace: pp-dev
nginx.ingress.kubernetes.io/backend-protocol: GRPC
nginx.ingress.kubernetes.io/force-ssl-redirect: ‘true’
nginx.ingress.kubernetes.io/grpc-backend: ‘true’
nginx.ingress.kubernetes.io/http2-push-off: ‘true’
nginx.ingress.kubernetes.io/proxy-buffer-size: 128k
nginx.ingress.kubernetes.io/proxy-buffering: ‘off’
nginx.ingress.kubernetes.io/proxy-read-timeout: ‘3600’
nginx.ingress.kubernetes.io/proxy-request-buffering: ‘off’
nginx.ingress.kubernetes.io/proxy-send-timeout: ‘3600’
nginx.ingress.kubernetes.io/server-snippet: |
grpc_read_timeout 300;
grpc_send_timeout 300;
client_body_timeout 60;
client_header_timeout 60;
client_max_body_size 1m;
nginx.ingress.kubernetes.io/ssl-redirect: ‘true’
managedFields:
* manager: helm
operation: Update
apiVersion: networking.k8s.io/v1
time: ‘2025-09-29T06:33:29Z’
fieldsType: FieldsV1
fieldsV1:
f:metadata:
f:annotations:
.: {}
f:ingress.kubernetes.io/rewrite-target: {}
f:meta.helm.sh/release-name: {}
f:meta.helm.sh/release-namespace: {}
f:nginx.ingress.kubernetes.io/backend-protocol: {}
f:nginx.ingress.kubernetes.io/proxy-buffer-size: {}
f:labels:
.: {}
f:app: {}
f:app.kubernetes.io/component: {}
f:app.kubernetes.io/instance: {}
f:app.kubernetes.io/managed-by: {}
f:app.kubernetes.io/name: {}
f:app.kubernetes.io/part-of: {}
f:app.kubernetes.io/version: {}
f:helm.sh/chart: {}
f:spec:
f:ingressClassName: {}
f:rules: {}
f:tls: {}
* manager: nginx-ingress-controller
operation: Update
apiVersion: networking.k8s.io/v1
time: ‘2025-09-29T06:34:01Z’
fieldsType: FieldsV1
fieldsV1:
f:status:
f:loadBalancer:
f:ingress: {}
subresource: status
* manager: dashboard
operation: Update
apiVersion: networking.k8s.io/v1
time: ‘2025-09-29T07:40:29Z’
fieldsType: FieldsV1
fieldsV1:
f:metadata:
f:annotations:
f:nginx.ingress.kubernetes.io/force-ssl-redirect: {}
f:nginx.ingress.kubernetes.io/grpc-backend: {}
f:nginx.ingress.kubernetes.io/http2-push-off: {}
f:nginx.ingress.kubernetes.io/proxy-buffering: {}
f:nginx.ingress.kubernetes.io/proxy-read-timeout: {}
f:nginx.ingress.kubernetes.io/proxy-request-buffering: {}
f:nginx.ingress.kubernetes.io/proxy-send-timeout: {}
f:nginx.ingress.kubernetes.io/server-snippet: {}
f:nginx.ingress.kubernetes.io/ssl-redirect: {}
spec:
ingressClassName: nginx
tls:
* hosts:
* sampleapp.dev.echonet
secretName: camunda-tls
rules:
* host: sampleapp.dev.echonet
http:
paths:
* path: /
pathType: Prefix
backend:
service:
name: camunda-zeebe-gateway
port:
number: 26500
status:
loadBalancer:
ingress:
* ip: 99.xxxx.99.151