Raise AD Forest Functional Level
In PowerShell type $CurrentForest = Get-ADForest Set-ADForestMode -Identity $CurrentForest -Server $CurrentForest.SchemaMaster -ForestMode Windows2008R2Forest
In PowerShell type $CurrentForest = Get-ADForest Set-ADForestMode -Identity $CurrentForest -Server $CurrentForest.SchemaMaster -ForestMode Windows2008R2Forest
Step by step instruction on SSTP VPN: Configure SSTP VPN with Self-Signed Certificate on Windows Server 2019 (msftwebcast.com)
Reallocate shadow storage for drive G: from G: to C: Elevated command prompt cmd> diskshadow diskshadow> list shadows all diskshadow> delete shadows volume G: diskshadow> exit cmd> vssadmin add shadowstorage /For=G: /On=C: /MaxSize=20GB cmd> exit