This issue can happen for Magento Cloud customers who trigger Blackfire builds at each deployment.

This means that at least step 3 of the configuration guide for Magento Cloud has been successfully completed.

Solving the issue

For each Blackfire environment you're working with for the Magento Cloud project: 

  1. Browse to its "builds" tab

  2. Click on the "i" icon next to Magento Cloud in the integrations list

  3. Open the advanced settings

  4. Scroll down to and check the "Disable SSL certificates verification" option, then Save the settings.

User journey as below:

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