zh-translation: /docs/reference/config/analysis/ist0119/index.md (#6483)

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---
title: JwtFailureDueToInvalidServicePortPrefix
layout: analysis-message
---
当认证策略指定使用 JWT 认证但目标 [Kubernetes 服务](https://kubernetes.io/docs/concepts/services-networking/service/)配置不正确时,会出现此消息。
正确定位到 Kubernetes 服务需要使用 http|http2|https 前缀来命名端口(请参见[协议选择](/zh/docs/ops/configuration/traffic-management/protocol-selection/)),并且还需要协议使用 TCP协议留空也可以因为其默认值就是 TCP。
## 示例{#example}
当您的集群有如下策略:
{{< text yaml >}}
apiVersion: authentication.istio.io/v1alpha1
kind: Policy
metadata:
name: secure-httpbin
namespace: default
spec:
targets:
- name: httpbin
origins:
- jwt:
issuer: "testing@secure.istio.io"
jwksUri: "https://raw.githubusercontent.com/istio/istio-1.4/security/tools/jwt/samples/jwks.json"
{{< /text >}}
它的目标服务如下:
{{< text yaml >}}
apiVersion: v1
kind: Service
metadata:
name: httpbin
namespace: default
labels:
app: httpbin
spec:
ports:
- name: svc-8080
port: 8080
targetPort: 80
protocol: TCP
selector:
app: httpbin
{{< /text >}}
您就会收到这条消息:
{{< text plain >}}
Warn [IST0119] (Policy secure-httpbin.default) Authentication policy with JWT targets Service with invalid port specification (port: 8080, name: svc-8080, protocol: TCP, targetPort: 80).
{{< /text >}}
在这个例子中,端口名为 `svc-8080`,没有遵循 `name: <http|https|http2>[-<suffix>]` 这种格式。
## 如何解决{#how-to-resolve}
- JWT 认证只支持 http、https 或 http2。将服务的端口重命名为 `<http|https|http2>[-<suffix>]` 这种格式即可。