# istio_ignore-port.yaml
apiVersion: release-notes/v2
kind: bug-fix
area: traffic-management
issues:
- 40474
releaseNotes:
- |
  **Fixed** an issue causing traffic to not match (and return a `404`) when using wildcard domain names and including an unexpected port in the `Host` header.
- |
  **Fixed** an issue causing traffic to match an unexpected route when using wildcard domain names and including an port in the `Host` header.
- |
  **Improved** sidecar `Host` header matching to ignore port numbers by default. This can be controlled by the `SIDECAR_IGNORE_PORT_IN_HOST_MATCH` environment variable.