This will take you to a screen listing the “Certification Path”. In Chrome or Edge, click on the same area, and select “Certificate”: If you’re using Google Chrome / Microsoft Edge Note that if you’ve got multiple proxies (perhaps for different network paths, or perhaps for a cloud proxy and an on-premises proxy) you might need to force yourself in into several situations to get these. ![]() Save this certificate somewhere sensible, we’ll need it in a bit! The details on the Certificate Authority (highly obscured!), but here is where we get our “Root” Certificate for this proxy. Click on the link to download the “PEM (cert)”. In recent versions of Firefox, clicking on “View Certificate” takes you to a new page which looks like this: Mammoth amounts of obscuring here! The chain runs from left to right, with the right-most blob being the Root CertificateĬlick on the right-most tab of this screen, and navigate down to where it says “Miscellaneous”. Certification Root obscured, but this where we prove we have a MITM certificate.Ĭlick on “More Information” to take you to the “Page info” screen More obscured details, but click on “View Certificate” In Firefox, click on this part of the address bar and click on the right arrow next to “Connection secure”: Clicking on the Padlock and then clicking on the Right arrow will take you to the “Connection Security” screen. These notes were initially based on a post by Mohclips from several years ago! Start with Windowsįrom your web browser of choice, visit any HTTPS web page that you know will be inspected by your proxy. Late edit : Following a conversation with SiDoyle, I added some notes at the end of the post about using the System CA path with the Python Requests library. I’ve previously mentioned that if you’re using Firefox on your work machines where you’ve had these certificates pushed to your machine, then you’ll need to enable a configuration flag to make those work under Firefox (“ security.enterprise_roots.enabled“), but this is talking about Linux (like Ubuntu, Fedora, CentOS, etc.) and Linux-like environments (like WSL, MSYS2) If you work in a predominantly Windows based environment, you may have had some TLS certificates deployed to your computer when you logged in, or by group policy. ![]() In some work environments, you may find that a “Man In The Middle” (also known as MITM) proxy may have been configured to inspect HTTPS traffic.
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