gulp trust-dev-cert without error, but access the page still failed

Question

After I upgrade my Nodejs to v9.3.0 and NPM to 5.5.1, failed to access the gulp serve server. The browser show the unsafe TLS security error. I have removed ~.gcb-serve-data/, and run the gulp trust-dev-cert without error, but I cannot find the cert in my trust certificates, I am working in Win10. Following is the **gulp trust-dev-cert" output:

[18:30:14] Starting gulp
[18:30:14] Starting 'trust-dev-cert'...
[18:30:14] Starting subtask 'configure-sp-build-rig'...
[18:30:14] Finished subtask 'configure-sp-build-rig' after 7.48 ms
[18:30:14] Starting subtask 'trust-cert'...
[18:30:14] Finished subtask 'trust-cert' after 79 ms
[18:30:14] Finished 'trust-dev-cert' after 90 ms
[18:30:14] ==================[ Finished ]==================

Answer 1

gulp trust-dev-cert must be executed IN the project folder.