🛡️ SSTP (Secure Socket Tunneling Protocol) is a VPN protocol developed by Microsoft that allows secure communication between a client and a server by tunneling traffic through an encrypted SSL/TLS channel.

🔐 What SSTP Does

• Encrypts data using SSL/TLS to protect it from eavesdropping
• Authenticates the server using certificates to ensure trust
• Bypasses firewalls by using TCP port 443—the same port as HTTPS traffic

🛠️ How SSTP Works

• Establishes a secure connection using SSL/TLS handshake
• Encapsulates PPP (Point-to-Point Protocol) packets inside the encrypted tunnel
• Transmits data securely over the internet, appearing like regular HTTPS traffic

💻 Where SSTP Is Used

• Built into Windows Vista SP1 and later
• Supported on Linux, BSD, and some routers like RouterOS
• Commonly used for remote access VPNs, especially in Windows environments

⚖️ Pros and Cons

🧠 Real-World Analogy

Think of SSTP like a secure tunnel through a mountain:

• The tunnel (SSL/TLS) hides everything inside
• The vehicles (PPP packets) travel safely without being seen
• The entrance is disguised as a regular highway (HTTPS), so it’s hard to block