RDP Error Message:
Resolution:
Method 1: Create and apply a self signed certificate on the server
$fqdn=$env:computername+$(if($env:USERDNSDOMAIN){'.'+$env:USERDNSDOMAIN})
$newCertificate=New-SelfSignedCertificate -certstorelocation cert:\localmachine\my -dnsname $fqdn
$thumbPrint=$newCertificate.Thumbprint
wmic /namespace:\\root\CIMV2\TerminalServices PATH Win32_TSGeneralSetting Set SSLCertificateSHA1Hash=$thumbPrint
Method 2: install an alternate RDP client
Method 3: fix firewall issues
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