I am using the GKE v1.14.10-gke.27+ with Istio (v1.2.10-gke.3) add-on. I have 2 golang apps (client & server) with gRPC. I am getting the following error on the client app when I use mTLS with strict mode.

rpc error: code = Unavailable desc = upstream connect error or disconnect/reset before headers. reset reason: connection failure

I am not getting this error on the GKE v1.17.5-gke.0 which has Istio v1.4.6-gke.0