Pods cannot communicate with FQDN in a proxy environment

Description

In a proxy environment, if the proxy server uses the same port as the TCP port of any other service in the Istio service mesh, such as port 8080, pods cannot communicate with the FQDN. The issue causes the following error:

System.Net.Http.HttpRequestException: The proxy tunnel request to proxy 'http://<proxyFQDN>:8080/' failed with status code '404'.

Solution

To fix the issue, you must create a ServiceEntry, as shown in the following example:

apiVersion: networking.istio.io/v1beta1
kind: ServiceEntry
metadata:
  name: proxy
  namespace: <uipath>
spec:
  hosts:
  - <proxy-host>
  addresses:
  - <proxy-ip>/32
  ports:
  - number: <proxy-port>
    name: tcp
    protocol: TCP
  location: MESH_EXTERNAL