# Unknown rule HostSNI on tcp router

**URL:** <https://community.traefik.io/t/unknown-rule-hostsni-on-tcp-router/13877>\
**Category:** Traefik v2\
**Tags:** tcp\
**Created:** [March 23, 2022, 3:21pm UTC](https://community.traefik.io/t/unknown-rule-hostsni-on-tcp-router/13877 "2022-03-23T15:21:34Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![splatadder](https://sea2.discourse-cdn.com/flex020/user_avatar/community.traefik.io/splatadder/32/5108_2.png) [@splatadder](https://community.traefik.io/u/splatadder)\
**Post date:** [March 23, 2022, 3:21pm UTC](https://community.traefik.io/t/unknown-rule-hostsni-on-tcp-router/13877/1 "2022-03-23T15:21:34Z")

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Hi,

this is probably a configuration error, but I've been a couple of hours on it and can't find it..  
I configured a tcp router, but it always errors out with:  
`unknown rule HostSNI`

Configuration:

```auto
        - "traefik.enable=true"
        - "traefik.docker.network=backend"
        - "traefik.tcp.routers.front.entrypoints=front_test"
        - "traefik.tcp.routers.front.rule=HostSNI('host1','host2')"
# - "traefik.tcp.routers.front.tls=true"
        - "traefik.tcp.routers.front.service=front"
        - "traefik.tcp.services.front.loadbalancer.server.port=999"

```

Does anyone have an ideia what could be wrong?

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<div class="post-metadata">

**Author:** ![splatadder](https://sea2.discourse-cdn.com/flex020/user_avatar/community.traefik.io/splatadder/32/5108_2.png) [@splatadder](https://community.traefik.io/u/splatadder)\
**Post date:** [March 23, 2022, 3:38pm UTC](https://community.traefik.io/t/unknown-rule-hostsni-on-tcp-router/13877/2 "2022-03-23T15:38:28Z")

</div>

Should have posted sooner...

I was using single quotes (`´`) instead of backticks (` ` `)...

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<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/flex020/uploads/containo/original/2X/b/bd81ebdb578656e76e56ff3cc3eed021d3ba132d.png) [@system](https://community.traefik.io/u/system)\
**Post date:** [March 26, 2022, 3:38pm UTC](https://community.traefik.io/t/unknown-rule-hostsni-on-tcp-router/13877/3 "2022-03-26T15:38:35Z")

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