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How do I get my Edge web browser to trust my local development Symfony website running in WSL?

I am coding a website on Windows 10 using WSL 1 (Windows Subsystem for Linux) with Ubuntu 18.04 LTS. I am using Symfony local web server. I would like to use https, testing the website at the URL https://localhost:8000 But web browsers say the website is not trusted. Edge (Chromium-based) shows a web page with these errors:

    Your connection isn't private
    Attackers might be trying to steal your information from localhost
    (for example, passwords, messages, or credit cards).
    NET::ERR_CERT_AUTHORITY_INVALID

Examining the certificate shows the error: This CA Root certificate is not trusted because it is not in the Trusted Root Certification Authorities store.

How do I prevent these errors?

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When you install the symfony command in WSL, the instructions say to run the command symfony server:ca:install. This creates some self-signed certificate files in ~/.symfony/certs/ The Windows 10 processes such as Edge need to be told about this certificate using the following procedure.

Copy ~/.symfony/certs/rootCA.pem to your Windows 10 Documents directory.
In Windows 10, search for "mmc" and run the Microsoft Management Console command.
Select File > Add Snap-in "Certificates" for current user.
Expand "Certificates - Current User"
Expand Trusted Root Certification Authorities
Click Certificates folder
Select Action > All Tasks > Import...
In the File chooser popup, select file filter All Files (*.*) and choose rootCA.pem
You will be prompted with a security warning. Verify the cert listed is the self-signed cert and click yes
(You may need to restart your browser or computer.)

This answer was adapted from here

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