Hi,
Thanks for posting in Q&A platform.
The pre-requisitions for SSTP VPN Tunnel type are one server with DC, DNS and ACCS role, one VPN server and one VPN client. VPN server needs join to the domain which hosted by the DNS server. You can configure your domain name in the DNS server.
SSTP tunneling uses TCP 443 to create an SSL connection. Any protocol that uses SSL requires the use of a certificate.
For more details regarding of how to configure SSTP VPN server in Windows server 2016, please refer to the following article:
Create an SSTP VPN Server in Windows Server 2016
Best Regards,
Sunny
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