Key Features of SSTP VPN:

SSTP (Secure Socket Tunneling Protocol) is a VPN protocol developed by Microsoft, primarily used for establishing secure, encrypted connections between a client and a server over the internet. Here’s a detailed overview:

1. Protocol & Encryption:

   • Uses SSL/TLS (port 443) for encryption, the same technology securing HTTPS websites.
   • Encapsulates data within the HTTPS protocol, making it difficult to block.

2. Platform Support:

   • Native on Windows (Vista SP1 and later).
   • Linux, macOS, Android, and iOS require third-party clients (e.g., OpenVPN can sometimes support SSTP).

3. Advantages:

   • Bypasses Firewalls: Traffic appears as regular HTTPS, evading deep packet inspection (DPI).
   • Strong Security: Uses AES encryption (like OpenVPN).
   • No Additional Ports Needed: Runs on port 443, reducing blockage risks.

4. Disadvantages:

   • Proprietary: Owned by Microsoft; lacks open-source transparency.
   • Limited Cross-Platform Support: Not natively supported on all OSes.

How SSTP Works:

1. The client initiates a connection to the SSTP server via port 443.
2. SSL/TLS negotiates encryption (e.g., AES-256).
3. After authentication (PPP), a secure tunnel is established.

Setup Example (Windows):

1. Configure Server (Windows Server Routing and Remote Access):

   • Install RRAS role.
   • Enable SSTP and assign a certificate (SSL).

2. Client Connection:

   • Go to Settings > VPN > Add VPN.
   • Select SSTP, enter server details, and authenticate.

Alternatives:

• OpenVPN: Open-source, highly configurable.
• WireGuard: Faster, modern, but easier to block.
• IPSec/L2TP: Widely supported but may be blocked.

Use Cases:

• Bypassing restrictive networks (e.g., schools, workplaces).
• Remote access to corporate resources securely.

Security Considerations:

• Ensure the SSL certificate is valid (avoid self-signed certs).
• Combine with multi-factor authentication (MFA) for stronger security.

If you need help setting up an SSTP VPN or troubleshooting, let me know!