TLS Certificate Verification Changes in Edge

Last Updated August 21 2023: When establishing a secure HTTPS connection with a server, a browser must validate that the certificate sent by the server is valid — that is to say, that: In the past, Chromium running on Windows delegated this validation task to APIs in the operating system, layering a minimal set ofContinue reading “TLS Certificate Verification Changes in Edge”

Mark-of-the-Web: Additional Guidance

I’ve been writing about Windows Security Zones and the Mark-of-the-Web (MotW) security primitive in Windows for decades now, with 2016’s Downloads and MoTW being one of my longer posts that I’ve updated intermittently over the last few years. If you haven’t read that post already, you should start there. Advice for Implementers At this point,Continue reading “Mark-of-the-Web: Additional Guidance”

“Not Secure” Warning for IE Mode

A customer recently wrote to ask whether there was any way to suppress the red “/!\ Not Secure” warning shown in the omnibox when IE Mode loads a HTTPS site containing non-secure images: Notably, this warning isn’t seen when the page is loaded in modern Edge mode or in Chrome, because all non-secure “optionally-blockable” resourceContinue reading ““Not Secure” Warning for IE Mode”

Microsoft Employee’s Guide to Maximizing Donations

Perhaps the most impactful perk for employees of Microsoft is that the company will match charitable donations up to a pretty high annual limit ($15K/year), and will also match volunteering time with a donation at a solid hourly rate up to that same cap. Years ago, I volunteered at a food bank in Seattle, butContinue reading “Microsoft Employee’s Guide to Maximizing Donations”

Q: Why do tabs sometimes show an orange dot?

Sometimes, you’ll notice that a background tab has an orange dot on it in Edge (or a blue dot in Chrome). If you click on the tab, the dot disappears. Why? The dot indicates that the tab wants “attention” — more specifically, that there’s a dialog in the tab asking for your attention. This mightContinue reading “Q: Why do tabs sometimes show an orange dot?”

Capturing Logs for Debugging SmartScreen

The Microsoft Edge browser makes use of a service called Microsoft Defender SmartScreen to help protect users from phishing websites and malicious downloads. The SmartScreen service integrates with a Microsoft threat intelligence service running in the cloud to quickly block discovered threats. As I explained last year, the SmartScreen service also helps reduce spurious securityContinue reading “Capturing Logs for Debugging SmartScreen”