How to fix EnvoyFilter rejected, validation failed, sync failed in Kubernetes | DevErrors
How to fix EnvoyFilter rejected, validation failed, sync failed in Kubernetes
KubernetesADVANCEDMEDIUM
EnvoyFilter configuration rejected by Istio control plane due to invalid spec. Fix by validating Envoy configuration, checking Istiod logs, and testing with simple config.
What this error means
Istio's Envoy proxy supports advanced traffic routing via EnvoyFilters. Invalid configurations are rejected by Istiod (Istio control plane).
Typical symptoms
Pod doesn't receive EnvoyFilter
Istiod shows validation errors
Traffic continues with old config
No error in kubectl describe
Common causes
Invalid Envoy configuration syntax
Unsupported Envoy API version
Missing required fields
Version mismatch between Istio and Envoy
How to fix "EnvoyFilter rejected, validation failed, sync failed"