https://www.theregister.co.uk/2018/01/04/azure_vms_down_following_meltdown_patch/

Microsoft Azure customers are reporting problems with their virtual machines, which are struggling to come back online after being updated with the Meltdown processor patch.

The firm told one customer in a direct message on Twitter: "We are currently investigating alerts affecting Virtual Machines in West Europe. You should be receiving messaging in your portal shortly."