Register Certificate for HTTPS Connection
PROBLEM
I'm working on a web application accessible via secure HTTP (HTTPS) with a URL like this:
- https://www.something.com
I encounter certificate-related warnings when the Test Studio recorder or runner is attached to the browser. I do not see this warning when the recorder or runner is not attached:

SOLUTION 1 - Standalone version and VS plugin
This is expected behavior and it's related to the way Test Studio hooks into the browser. If this warning is a problem for your test automation, use the Register certificate for https connection feature:
- Load Project Settings and go to the General menu item.
- Click Register certificate for https connection under Connection settings.
- You are prompted to install a certificate. Click Yes. After installing the certificate, you will no longer receive the certificate-related warning when automating your application with Test Studio.

Note: Ensure that installing the certificate does not violate your company's security policies.
SOLUTION 2 - Run-Time Edition
Without a full version of Test Studio installed, there is no GUI to register the certificate as outlined above. This can be done from the command line, however.
Open a command prompt and navigate to the following directory:
- C:\Program Files (x86)\Telerik\Test Studio 20XX.X\Bin
Then enter the following command:
ArtOfTest.WebAii.HttpProxy.exe InstallCertificate