If your server is running unresponsive with high CPU usage attributed by something called ‘Local Service (No Network)’, then it probably is an issue with Windows Firewall.
The error can occur when Microsoft attempts to re-authenticate a user. This could be because Microsoft has detected suspicious activity or just because it has been a while since the user authenticated themselves. It is quite easy to resolve.
Sometimes you may need to set an Outlook Out-of-Office message for a user that doesn’t have access to their email. This can be done from the Microsoft 365 Admin Centre.
One of the first steps when moving to the cloud is setting up a network connection from your existing network to Azure. A Virtual Private Network (VPN) between your office and Azure is secure and it’s not too hard to do!