# Can't connect using phpMQTT.php

**URL:** <https://community.hivemq.com/t/cant-connect-using-phpmqtt-php/2046>\
**Category:** HiveMQ Cloud\
**Created:** [May 5, 2023, 10:11am UTC](https://community.hivemq.com/t/cant-connect-using-phpmqtt-php/2046 "2023-05-05T10:11:04Z")\
**Posts on this page:** 1\
**Showing post:** 4

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**Author:** ![Diego](https://avatars.discourse-cdn.com/v4/letter/d/f04885/32.png) [@Diego](https://community.hivemq.com/u/Diego)\
**Post date:** [May 5, 2023, 1:36pm UTC](https://community.hivemq.com/t/cant-connect-using-phpmqtt-php/2046/4 "2023-05-05T13:36:53Z")

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Hi @akkyuz looking into our community forum I saw this thread [Cannot connect using phpMQTT](https://community.hivemq.com/t/cannot-connect-using-phpmqtt/1593)

It seems that PHP library does require our server cert (CA).

You can download the root certificate [here](https://letsencrypt.org/certs/isrgrootx1.pem).  
This will create a file called “isrgrootx1.pem”, which you can use as a “Server Certificate”.

Kind regards,  
Diego from HiveMQ Team

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