Anthos Service mesh (istio) and keycloak pod connection error to external postgres

Question

I have installed Anthos service mesh in my GKE cluster and a keycloak statefulset that connect to an external database in GCP. When the istio sidecar are in the keycloak pod, I get this error in keycloak container:

keycloak 07:21:54.00 ERROR ==> Unable to connect to host XXX.XXX.XXX.XXX

In the istio_proxy container I get this error:

Error stsserver http: Server closed

Error: failed to start xds proxy: failed to build TLS dial option to talk to upstream: failed to find root CA cert for XDS: root CA file for XDS does not exist ./var/run/secrets/kubernetes.io/serviceaccount/ca.crt 2022-02-28T07:23:00.961316Z error failed to start xds proxy: failed to build TLS dial option to talk to upstream: failed to find root CA cert for XDS: root CA file for XDS does not exist ./var/run/secrets/kubernetes.io/serviceaccount/ca.crt

I have other two pods that connects to the database and thoose works fine, but keycloak doesn't

Can anyone helps me?

Thanks