Virtual machine could not be started because the hypervisor is not running

Issue

Cannot launch any virtual machines on a Hyper-V host server (Windows Server 2016 Standard). Following error message is displayed when trying to start a VM:

Hyper-V Manager
An error occurred while attempting to start the selected virtual machine(s).
<VM-NAME> failed to start.
Virtual machine could not be started because the hypervisor is not running.

Can't install DELL iDRAC 5 Virtual Media ActiveX plugin

Issue

Dell iDRAC 5 Virtual Media ActiveX plugin cannot be installed. When trying to install it Internet Explorer reloads the page and asks to login again. Usual tricks such as adding the site to Compatibility View list and Trusted Sites don't help. 

Remote Desktop Connection - An Authentication Error Has Occurred

Issue

Cannot connect to Windows Sever 2016 machines (Hyper-V VMs) via Remote Desktop. The same error occurs when trying to connect locally via Hyper-V Manager.

Remote Desktop Connection
An authentication error has occurred.
The function requested is not supported
Remote Computer: <Computer Name>
This could be due to CredSSP encryption oracle remediation.
For more Information, see https://go.microsoft.com/fwlink/?linkid=866660

Disable MS Outlook Junk Mail filtering via Group Policy

To disable Junk Mail feature in Outlook 2010 add following registry entry on client computers via Group Policy (User Configuration > Preferences > Windows Settings > Registry)

• Action: Update
• Five: HKEY_CURRENT_USER
• Key Path: Software\Policies\Microsoft\Office\14.0\Outlook
• Value Name: DisableAntiSpam
• Value Type: REG_DWORD
• Value Data: 1