In order to use the HackerOne Gateway, you need to install the Cloudflare for Teams ECC Certificate Authority.
Refer to these installation and configuration instructions for your platform:
Note: Firefox manages its own trusted certificate list, so you always need to add the root authority certificate to the browser even if you've installed it system wide.
To install the HackerOne VPN Root CA to your Windows machine:
Right-click the certificate file.
Click Open. If you see a Security Warning, click Open to proceed.
Click Install Certificate....
Select Local Machine and click Next.
Click Yes to allow the changes.
Select Place all certificates in the following store.
Select Trusted Root Certification Authorities from the list and click OK.
To install the Cloudflare for Teams ECC Certificate Authority to your macOS platform:
Double-click the .crt file.
In the pop-up message, choose the option that suits your needs (login, Local Items, or System) and click Add.
Double-click on the Cloudflare for Teams ECC Certificate Authority in KeyChain Access.
Set the certificate to Always Trust in the window that appears.
Execute the following commands in your terminal to download and install the HackerOne VPN Root CA:
sudo wget https://developers.cloudflare.com/cloudflare-one/static/documentation/connections/Cloudflare_CA.crt
The command will state that it has installed one (or more) new certificates, through which the certificate has been successfully added to the Operating System.
To install the HackerOne VPN Root CA to Firefox:
Open Preferences and go to Privacy & Security.
Scroll down to the Certificates section, and click View Certificates....
Click the Import... tab.
Select the Cloudflare_CA.crt file.
Check Trust this CA to identify websites and click OK.
The "Cloudflare for Teams ECC Certificate Authority" certificate is now visible in your list of certificates.