I have been using settings sync in Visual Studio Code since it was first released in the Insiders build and it has been working well for me, I currently sync settings from Insiders and Stable releases on four different Windows machines and one MacBook Pro. Then, all of a sudden the Insiders instance on one of the Windows computers stopped syncing; Weirdly enough, the Stable build on the same machine kept happily working and syncing settings, suggesting the problem was specific to this Insiders installation and not some machine wide problem. It’s worth pointing out again installation, it was not even a problem with the general Insiders build since the same build was still working fine on all other machines. At first I tried to start VSCode without extensions (code-insiders --disable-extensions), then I tried to fully remove VSCode (and manually deleted all relevant folders under my local profile), restarted Windows… the usual deal, all with no luck. I then decided to open an issue on GitHub (more on that later) while I continued my investigation; the first comment from RMacfarlane suggested something might have changed with the network configuration on the machine, but again, that should have affected the Stable…