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When using a Self-Signed Certificate which was create outside of Ignition, you will need to construct a CA Chain Certificate to If you do not have access to or cannot easily locate your Intermediate and/or Root CA Certificates required to be used by the MQTT Modules.The CA Chain Certificate will comprise of all Intermediate CA certificates and the Root CA concatenated into a single cert file. You can download the source files required , you can download by using the Firefox browser.

Using Firefox, make a connection on port 8043 on the Ignition URL using a private window. 

You will be warned of a Potential Security Risk. Select Advanced and then select View Certificate.

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The browser will show each of the certificates available.  Download the files from each of the Intermediate CA and Root CA tabs using Select the appropriate tab(s) and scroll down to find the download file link . 

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Construct the CA Chain Cert by concatenating these downloaded files into a single new file. 

In this example, we first have the CLS Testing Intermediate CA which is the concatenated with the CLS Root CA

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to download each cert file..Image Added

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