In connection with recently discovered Meltdown-Spectre bug in modern processors we are going to install emergency fix KB4056890 (https://support.microsoft.com/en-us/help/4056890/windows-10-update-kb4056890) on Hyper-V machines running customer builds and some infrastructure components. During this update some VMs will be switched to an alternative router with public IP 67.225.138.82 - make sure this IP is allowed on your firewall if you have IP restrictions applied. Full list of AppVeyor IPs can be found here: https://www.appveyor.com/docs/build-environment/#ip-addresses