# Wildcard certificate does not work

**URL:** <https://community.traefik.io/t/wildcard-certificate-does-not-work/25544>\
**Category:** Traefik v3 (latest)\
**Tags:** docker\
**Created:** [December 12, 2024, 1:09pm UTC](https://community.traefik.io/t/wildcard-certificate-does-not-work/25544 "2024-12-12T13:09:32Z")\
**Posts on this page:** 1\
**Showing post:** 12

<div class="post-metadata">

**Author:** ![bluepuma77](https://avatars.discourse-cdn.com/v4/letter/b/a9adbd/32.png) [@bluepuma77](https://community.traefik.io/u/bluepuma77)\
**Post date:** [December 15, 2024, 12:51pm UTC](https://community.traefik.io/t/wildcard-certificate-does-not-work/25544/12 "2024-12-15T12:51:36Z")

</div>

Maybe try switching around:

```auto
      - "traefik.http.routers.wildcard_cert.tls.domains[0].main=sub.example.com"
      - "traefik.http.routers.wildcard_cert.tls.domains[0].sans=*.sub.example.com"
      - "traefik.http.routers.wildcard_cert.tls.domains[1].main=example.com"
      - "traefik.http.routers.wildcard_cert.tls.domains[1].sans=*.example.com"

```

Or try ([related post](https://community.traefik.io/t/how-get-multiple-sub-domain-as-sans/5254/2))

```auto
      - "traefik.http.routers.wildcard_cert.tls.domains[0].main=example.com"
      - "traefik.http.routers.wildcard_cert.tls.domains[0].sans=*.example.com,*.sub.example.com"

```

Make sure domain or zone `sub.` os registered with your DND provider.

---

_[View the full topic](https://community.traefik.io/t/wildcard-certificate-does-not-work/25544)._