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

Setup L2TP / IPSec VPN on Windows Server 2016

Following tutorial shows how to setup Windows Server 2016 (single NIC, behind NAT/Firewall) as a L2TP / IPSec VPN Server.

Install Remote Access Role

• Open Server Manager > Manage > Add Roles and Features and add Remote Access role.
• On Role Services screen choose only DirectAccess and VPN (RAS).
  

Cannot delete legacy mailbox on Exchange 2010 - Access is Denied

Issue

Some mailboxes on Microsoft Exchange 2010 cannot be deleted via Exchange Management Console. Following error is displayed:

Active Directory operation failed on <domain controller>. This error is not retriable. Additional information: Access is Denied. Active directory response: 00000005: SecErr: DSID-033520B4, problem 4003 (INSUFF_ACCESS_RIGHTS), data 0

The affected mailboxes seem to be those that were moved during Exchange Upgrades from Exchange 2003 > 2007 > 2010.