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DNS over TLS available to Windows Insiders

Credit and thanks to Alex Jercaianu, Matthew Cox, Miguel Reyes Badilla, and Milan Justel for implementation work DNS over TLS (DoT) is an alternative encrypted DNS protocol to DNS over HTTPS (DoH). Where DoH treats DNS traffic as one more HTTPS data stream over port 443, DoT dedicates port 853 to encrypted DNS traffic and […]

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Aligning on mDNS: ramping down NetBIOS name resolution and LLMNR

The modern standard for multicast name discovery is mDNS. However, Windows supports other multicast name resolutions protocols for historical reasons, including NetBIOS name resolution and LLMNR. More details about the documentation for each of these protocols can be found here. NetBIOS name resolution and LLMNR are rarely used today. This means that having them enabled

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Troubleshooting HTTP/3 in http.sys

HTTP/3 is a major change to HTTP. It switches away from using TCP as a transport and TLS separately to using QUIC as a transport which has TLS 1.3 or higher built in. These changes mean that migrating from HTTP/2 to HTTP/3 can uncover unexpected issues due to previously non-problematic configurations. Here are some configurations

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Making DoH Discoverable: Introducing DDR

Credit and thanks to Alexandru Jercaianu for implementation work DNS over HTTPS (DoH) in the DNS client exited preview and became a supported feature with the Windows Server 2022 and Windows 11 releases. Unlike plain-text DNS, DoH requires a template in addition to knowing the IP address of the resolver. If only the DoH template

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Enabling HTTP/3 support on Windows Server 2022

Credit and thanks to Matthew Cox and Daniel Ring for implementation work Windows Server 2022 is currently in preview as announced earlier this year. One of the new features it brings is native support for hosting HTTP/3 services. In this post, we will discuss how to enable it and how it can benefit web services.

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Windows Server Insiders getting gRPC support in Http.sys

We keep hearing many of you are eager to host gRPC-enabled services on IIS in Azure, such as here on GitHub. However, the lack of support for several HTTP features in the platform components is blocking you. We listened, and we have good news: we built HTTP support for gRPC into Http.sys! We are targeting the

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Windows Insiders can now test DNS over HTTPS

If you have been waiting to try DNS over HTTPS (DoH) on Windows 10, you’re in luck: the first testable version is now available to Windows Insiders! If you haven’t been waiting for it, and are wondering what DoH is all about, then be aware this feature will change how your device connects to the Internet

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