MQTT explorer is unable to verify the first certificate

[dagvegar]

Hello,

I get the error message in red when pressing Connect below:

The certificate is downloaded as instructed in the devacademy 4.2.

server_certificate.crt:

-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

What is wrong?

[dejans]

Hi,

I have looked at the lesson 4 exercise 2. Below is relevant part from the step 10 (first screenshot is from step 9).

10. Add the server (MQTT broker) root certificate (server_certificate.crt) by clicking on the ADVANCED button. Click on the CERTIFICATES,

then select SERVER CERTIFICATE (CA) and select the .crt file we downloaded in step 3.1.

Click back twice, and make sure to save the connection settings.

You could start by checking that you have not skipped any action (adding certificate, selecting certificate and saving connection settings) described in the step 10.

Best regards,
Dejan

[dagvegar]

Hello,

Thanks for answering.

I have followed the steps once again, and it is the same.

dejans , does it work for you?

If not, maybe the certificate is outdated? The normal tcp works fine, tls does not and fails as described.

[dagvegar]

Now it just started to work. I have just waited and tried again, so I guess the server has been busy or something.

[dejans]

Hi,

dagvegar said:

Now it just started to work. I have just waited and tried again, so I guess the server has been busy or something.

This is great to hear. Thank you for the update.

Best regards,
Dejan