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Windows 10 Insider Build 17730 Is Now Available. Here’s Whats New!


Today Microsoft released Windows 10 Insider Preview Build 17730 (Redstone 5) to the Insiders on the Fast Ring. This build continues to enhance the Your Phone experience with Android photo synching and iOS “Continue on your PC” being enabled. This build also introduces HTTP/2 to Edge and lower network latency with Cubic, the new TCP congestion provider.

Build 17730 Insider Update
Build 17728 Insider Update

Below is a list of the changes in this build.

Your Phone app is now LIVE!

With this release, the Your Phone app is now live and allows you to synchronize photos on your Android phone with the Your Phone app on Windows 10 PCs. This allows you to easily transfer your photos from your Android mobile devices. In order for this to work, Android users will need to install the Microsoft Apps Android program.

For iOS users, if you are browsing the web and want to finish reading an article on your PC, you can select continue on PC. This will cause your Windows 10 PC to open Edge to the article you were reading at the place you left off.

Faster Networking with HTTP/2 and Cubic

This build also brings the HTTP/2 protocol to Microsoft Edge in order to “take advantage of connection coalescing for HTTP/2 as supported in Windows Server 2019.” This technology increases the speed of browsing the web by utilizing various features such as compression, response multiplexing, and more.

“The primary goals for HTTP/2 are to reduce latency by enabling full request and response multiplexing, minimize protocol overhead via efficient compression of HTTP header fields, and add support for request prioritization and server push” as explained by Google.

Cubic is the name of the TCP congestion provider currently being used in Windows Server and is now being added to Windows 10. 

“So, why should you care that the new default is Cubic? Because Cubic is faster and fairer for the end-user,” Microsoft explains in their networking blog. “Cubic is especially well suited for high bandwidth, high latency links where Standard TCP tends to perform poorly. If you are an admin and have a need to send a significant amount of data over a high bandwidth, high latency (long distance) link, you will like the benefits that Cubic brings.”

To see the entire release notes, you can read the blog post. Below are the latest fixes and changes in build 17730:

General changes, improvements, and fixes for PC

  • We have fixed the issue impacting WDAG, Remote Desktop and Hyper-V. Remote Desktop Client (mstsc.exe) users should no longer see an error dialog complaining about low virtual memory when a connection is being established. And users can use enhanced sessions in Virtual Machine Connection (vmconnect.exe) again.
  • Thank you everyone who has given us feedback on the “Block Suspicious Behaviors” feature that was recently added to Windows Security. For the time being we’re removing it from the build while we work on addressing some of the things you shared with us.
  • We fixed an issue resulting in the volume slider in certain apps performing poorly with touch in recent flights.
  • We fixed an issue resulting in certain apps, like the Twitter app, not rendering content when navigating after a while.
  • We fixed an issue where expanding the Driver Updates dropdown in View Update History in Settings didn’t list anything (even when there were items to list) in recent builds.

Known issues

  • Clicking a link to launch one app from another app may not work for some Insiders. We’re investigating.
  • We’re progressing in our work on adding dark theme in File Explorer and the Common File Dialog, but we still have a few things left to do. You may see some unexpectedly light colors in these surfaces when in dark mode and/or dark on dark text.
  • When you upgrade to this build you’ll find that the taskbar flyouts (network, volume, etc) no longer have an acrylic background.
  • When you use the Ease of Access Make Text bigger setting, you might see text clipping issues, or find that text is not increasing in size everywhere.
  • When you set up Microsoft Edge as your kiosk app and configure the start/new tab page URL from assigned access Settings, Microsoft Edge may not get launched with the configured URL. The fix for this issue should be included in the next flight.
  • You may still see the notification count icon overlapping with the extension icon in the Microsoft Edge toolbar when an extension has unread notifications.
  • On Windows 10 in S Mode, launching Office in the Store may fail to launch with an error about a .dll not being designed to run on Windows. The error message is that a .dll “is either not designed to run on Windows or it contains an error. Try installing the program again…” Some people have been able to work around this by uninstalling and reinstalling Office from the Store.
  • When using Narrator Scan mode you may experience multiple stops for a single control. An example of this is if you have an image that is also a link. This is something we are actively working on.
  • When using Narrator Scan mode Shift + Selection commands in Microsoft Edge, the text does not get selected properly.
  • We’re investigating a potential increase in Start reliability and performance issues in this build.
  • After setting up a Windows Mixed Reality headset for the first time on this build with motion controllers, the controllers may need to be re-paired a second time before appearing in the headset.
  • When using a Windows Mixed Reality immersive app, saying “Flashlight on,” may fail to activate the flashlight feature even though the status appears as active on the Start menu.

Known issues for Developers

  • If you install any of the recent builds from the Fast ring and switch to the Slow ring – optional content such as enabling developer mode will fail. You will have to remain in the Fast ring to add/install/enable optional content. This is because optional content will only install on builds approved for specific rings.
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