In this section, you'll get familiar with the key capabilities of Abdal 4iProto Server — a powerful tunneling server designed with advanced features for security, traffic monitoring, and connection control.
Whether you're a system administrator, a power user, or a developer, these features are built to give you full control, high performance, and unmatched visibility over your network tunnels.

• Built-in Brute Force Protection: Automatic IP blocking after failed authentication attempts
• Attack Monitoring: Detailed logging of failed login attempts with IP tracking
• Customizable Authentication: Configurable maximum authentication attempts
• IP Blocking System: Persistent blocked IP management with JSON storage
• Server Banner Customization: Hide or customize server banner via configuration
• Setting Access Levels: Has two modes: User and Administrator. Administrators have the capability to execute commands in the operating system shell, while Users can only establish tunnels.

• Real-time Traffic Tracking: Monitor upload/download usage per user
• Session-based Statistics: Track bytes sent/received per session
• Total Usage Analytics: Cumulative traffic statistics across all sessions
• Automatic Data Persistence: Traffic data saved to JSON files every 10 seconds
• Live Bandwidth Monitoring: Real-time bandwidth usage display
• Blocking Unauthorized Websites: Blocks websites that you do not want the user to visit.
• Blocking Unauthorized IPs: Blocks IP addresses that you do not want the user to visit.
• Tracking Visited Websites: The ability to track the websites visited by the user, a feature you can enable or disable

• Multi-port Support: Run server on multiple ports simultaneously
• TCP Forwarding: Direct TCP connection forwarding without additional configuration
• UDP Forwarding: Full UDP traffic forwarding support
• Cross-platform: Runs on both Linux and Windows systems
• High Performance: 10x faster than OpenSSH for tunneling operations

• User Management: JSON-based user authentication system
• Shell Integration: Native CMD support on Windows and Shell on Linux
• Configuration Management: JSON-based server configuration
• Logging System: Comprehensive logging of connections and attacks

• Built-in Session Control: Administrators can define how many concurrent sessions each account can open at the same time.

• Automatic Session Expiration: Each session has a defined Time To Live (TTL). Expired sessions are automatically terminated to free resources.

• Dynamic Connection Handling: When the session limit is reached, new connections can be rejected or queued — fully configurable.

• Real-time Session Monitoring: Tracks and logs all active sessions in real time for auditing and analytics.

• Immediate blocking of new connections when sessions are saturated: If an account exceeds the allowed session limit, any new users attempting to connect will be blocked from the very beginning and denied access.

• Rate Limiting: Define per-user data transfer speed limits (max_speed_kbps) in KB/s. Applied in real time using the Token Bucket algorithm for both upload and download.
  📌 Example: 1024 = 1 MB/s

• Traffic Limit Enforcement: Define total traffic usage caps (max_total_mb) in MB. If a user exceeds the quota, access is denied at login or forcefully disconnected during active sessions.
  📌 Example: 10240 = 10 GB

• Real-time Bandwidth Enforcement: Traffic usage is checked every 1–2 seconds. If usage exceeds the defined limit, the session is immediately terminated.