Remote desktop connection not working after CredSSP update

After Windows 10 1803 Cumulative update it's not allowed to connect with RDP to unpatched machines.
To disable security check - create DWORD AllowEncryptionOracle in registry:

HKLM\Software\Microsoft\Windows\CurrentVersion\Policies\System\CredSSP\Parameters\
Set AllowEncryptionOracle = 2

Be aware that disabling security check makes your machine vulnerable!

Source:  support.microsoft.com

Log off user from remote machine

Find user's session ID:
QWINSTA /SERVER:<hostname>

Log off user:
LOGOFF <sessionid> /SERVER:<hostname> /V

Send test email from PowerShell

Send-MailMessage -SMTPServer 192.168.0.1 -To to@email.com -From from@email.com -Subject "This is a test email" -Body "Hi, this is a test email"

Source: https://serverfault.com

Remote Desktop Connection - How to get the certificate prompt back?

Delete server connection keys from here:
HKEY_CURRENT_USER\Software\Microsoft\Terminal Server Client\Servers
HKCU\Software\Microsoft\Terminal Server\Client\LocalDevices\<name>

Export Putty settings

regedit /e "%USERPROFILE%\putty.reg" HKEY_CURRENT_USER\Software\SimonTatham

Identify Windows 10 installation media build

Run Command Prompt as administrator
adism /Get-WimInfo /WimFile:F:\sources\install.esd /index:1

Windows 10 lock screen picture file location

If you want to save some Windows Spotlight picture - open the folder:
C:\Users\<User>\AppData\Local\Packages\Microsoft.Windows.ContentDeliveryManager_cw5n1h2txyewy\LocalState\Assets\

Look for the files with current date greater than 400KB.
Open files with MSPaint to find the exact one. Save it to *.jpg