# MQTT Engine \<\> Azure Event Grid

**URL:** <https://forum.inductiveautomation.com/t/mqtt-engine-azure-event-grid/81150>\
**Category:** 3rd Party Modules\
**Tags:** ignition81\
**Created:** [October 30, 2023, 9:04am UTC](https://forum.inductiveautomation.com/t/mqtt-engine-azure-event-grid/81150 "2023-10-30T09:04:52Z")\
**Posts on this page:** 4\
**Page:** 1

<div class="post-metadata">

**Author:** ![SBL\_MC](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/sbl_mc/32/56813_2.png) [@SBL\_MC](https://forum.inductiveautomation.com/u/SBL_MC)\
**Post date:** [October 30, 2023, 9:04am UTC](https://forum.inductiveautomation.com/t/mqtt-engine-azure-event-grid/81150/1 "2023-10-30T09:04:52Z")

</div>

Hi all,

Has anyone successful connected the MQTT Engine module to Azure Event Grid MQTT broker?

 ![MicrosoftTeams-image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/6/4/64dd017bb32ac93238b7e438733849c143d6fd5f.png)

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<div class="post-metadata">

**Author:** ![apimente](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/apimente/32/4030_2.png) [@apimente](https://forum.inductiveautomation.com/u/apimente)\
**Post date:** [November 11, 2024, 2:00pm UTC](https://forum.inductiveautomation.com/t/mqtt-engine-azure-event-grid/81150/2 "2024-11-11T14:00:12Z")

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I've tried the same approach and encountered the same issue.

I was considering making some changes when generating the self-signed certificates, but since you've experienced the same problem, it seems there might be another underlying cause.

This is my complete log output:

```python
org.eclipse.paho.client.mqttv3.MqttException: MqttException

at org.eclipse.paho.client.mqttv3.internal.ExceptionHelper.createMqttException(ExceptionHelper.java:38)

at org.eclipse.paho.client.mqttv3.internal.ClientComms$ConnectBG.run(ClientComms.java:738)

at java.base/java.lang.Thread.run(Unknown Source)

Caused by: javax.net.ssl.SSLHandshakeException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target

at java.base/sun.security.ssl.Alert.createSSLException(Unknown Source)

at java.base/sun.security.ssl.TransportContext.fatal(Unknown Source)

at java.base/sun.security.ssl.TransportContext.fatal(Unknown Source)

at java.base/sun.security.ssl.TransportContext.fatal(Unknown Source)

at java.base/sun.security.ssl.CertificateMessage$T12CertificateConsumer.checkServerCerts(Unknown Source)

at java.base/sun.security.ssl.CertificateMessage$T12CertificateConsumer.onCertificate(Unknown Source)

at java.base/sun.security.ssl.CertificateMessage$T12CertificateConsumer.consume(Unknown Source)

at java.base/sun.security.ssl.SSLHandshake.consume(Unknown Source)

at java.base/sun.security.ssl.HandshakeContext.dispatch(Unknown Source)

at java.base/sun.security.ssl.HandshakeContext.dispatch(Unknown Source)

at java.base/sun.security.ssl.TransportContext.dispatch(Unknown Source)

at java.base/sun.security.ssl.SSLTransport.decode(Unknown Source)

at java.base/sun.security.ssl.SSLSocketImpl.decode(Unknown Source)

at java.base/sun.security.ssl.SSLSocketImpl.readHandshakeRecord(Unknown Source)

at java.base/sun.security.ssl.SSLSocketImpl.startHandshake(Unknown Source)

at java.base/sun.security.ssl.SSLSocketImpl.startHandshake(Unknown Source)

at org.eclipse.paho.client.mqttv3.internal.SSLNetworkModule.start(SSLNetworkModule.java:159)

at org.eclipse.paho.client.mqttv3.internal.ClientComms$ConnectBG.run(ClientComms.java:724)

... 1 common frames omitted

Caused by: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target

at java.base/sun.security.validator.PKIXValidator.doBuild(Unknown Source)

at java.base/sun.security.validator.PKIXValidator.engineValidate(Unknown Source)

at java.base/sun.security.validator.Validator.validate(Unknown Source)

at java.base/sun.security.ssl.X509TrustManagerImpl.checkTrusted(Unknown Source)

at java.base/sun.security.ssl.X509TrustManagerImpl.checkServerTrusted(Unknown Source)

... 15 common frames omitted

Caused by: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target

at java.base/sun.security.provider.certpath.SunCertPathBuilder.build(Unknown Source)

at java.base/sun.security.provider.certpath.SunCertPathBuilder.engineBuild(Unknown Source)

at java.base/java.security.cert.CertPathBuilder.build(Unknown Source)

... 20 common frames omitted

```

Regards

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<div class="post-metadata">

**Author:** ![Kevin\_Ortega](https://avatars.discourse-cdn.com/v4/letter/k/c67d28/32.png) [@Kevin\_Ortega](https://forum.inductiveautomation.com/u/Kevin_Ortega)\
**Post date:** [April 21, 2026, 3:37pm UTC](https://forum.inductiveautomation.com/t/mqtt-engine-azure-event-grid/81150/3 "2026-04-21T15:37:26Z")

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Did you ever make any progress on this? I am looking to integrate Ignition MQTT with Azure Event Grid.

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<div class="post-metadata">

**Author:** ![SBL\_MC](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/sbl_mc/32/56813_2.png) [@SBL\_MC](https://forum.inductiveautomation.com/u/SBL_MC)\
**Post date:** [April 22, 2026, 6:40am UTC](https://forum.inductiveautomation.com/t/mqtt-engine-azure-event-grid/81150/4 "2026-04-22T06:40:22Z")

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We had some success, but at the time we were testing event grid mqtt functionality was lacking stuff. I think missing birth messages replies caused some issues.