# Client is not authorized to connect

**URL:** <https://community.hivemq.com/t/client-is-not-authorized-to-connect/856>\
**Category:** HiveMQ Cloud\
**Created:** [December 3, 2021, 5:32am UTC](https://community.hivemq.com/t/client-is-not-authorized-to-connect/856 "2021-12-03T05:32:17Z")\
**Posts on this page:** 1\
**Showing post:** 37

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**Author:** ![simon\_b](https://avatars.discourse-cdn.com/v4/letter/s/f07891/32.png) [@simon\_b](https://community.hivemq.com/u/simon_b)\
**Post date:** [April 1, 2022, 7:33am UTC](https://community.hivemq.com/t/client-is-not-authorized-to-connect/856/37 "2022-04-01T07:33:34Z")

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Hello,

Can you take another look at your wireshark dump and check the TLS Client Hello?  
For Free and Pay As You Go, we require the TLS-SNI extension to be available and used. (See screenshot below).

We ran some tests on embedded C clients so far, but only on the Arduino platforms. Those do support TLS-SNI.

 ![payg-sni](https://canada1.discourse-cdn.com/flex035/uploads/hivemq1/original/1X/7d06fe6a6ef81236d28a855bb895280851b9a828.png)

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