diff --git a/scripts/install_native.sh b/scripts/install_native.sh
index fabed31..57e9384 100755
--- a/scripts/install_native.sh
+++ b/scripts/install_native.sh
@@ -24,6 +24,7 @@ SKIP_BUILD=false
 DOMAIN=""
 EMAIL=""
 SKIP_SSL=false
+USE_EXISTING_MONITORING=false
 
 while [[ $# -gt 0 ]]; do
     case $1 in
@@ -47,6 +48,14 @@ while [[ $# -gt 0 ]]; do
             SKIP_SSL=true
             shift
             ;;
+        --use-existing-monitoring)
+            USE_EXISTING_MONITORING=true
+            shift
+            ;;
+        --non-interactive)
+            INTERACTIVE=false
+            shift
+            ;;
         --help)
             echo "Usage: $0 [OPTIONS]"
             echo ""
@@ -54,8 +63,10 @@ while [[ $# -gt 0 ]]; do
             echo "  --with-monitoring    Install Prometheus, Grafana, and AlertManager"
             echo "  --skip-build         Skip building the application (use existing binary)"
             echo "  --domain DOMAIN      Domain name for SSL certificate (e.g., gateway.example.com)"
-            echo "  --email EMAIL        Email for Let's Encrypt certificate notifications"
+            echo "  --email EMAIL        Email for Let's Encrypt certificate notifications (required for SSL)"
             echo "  --skip-ssl           Skip SSL/HTTPS setup (HTTP only)"
+            echo "  --use-existing-monitoring  Don't install Prometheus/Grafana (use existing stack)"
+            echo "  --non-interactive    Skip all prompts (use command line flags only)"
             echo "  --help               Show this help message"
             echo ""
             echo "Example:"
@@ -70,8 +81,67 @@ while [[ $# -gt 0 ]]; do
     esac
 done
 
+# Check for INTERACTIVE variable (add if not exists)
+if [ -z "${INTERACTIVE+x}" ]; then
+    INTERACTIVE=true
+fi
+
+# Interactive setup for monitoring if not specified
+if [ "$INTERACTIVE" = true ] && [ "$ENABLE_MONITORING" = false ] && [ "$USE_EXISTING_MONITORING" = false ]; then
+    echo ""
+    echo "🔍 Monitoring Setup"
+    echo "==================="
+    echo "Do you have an existing Prometheus/Grafana monitoring stack? (y/N)"
+    read -r HAS_EXISTING
+    
+    if [ "${HAS_EXISTING,,}" = "y" ] || [ "${HAS_EXISTING,,}" = "yes" ]; then
+        USE_EXISTING_MONITORING=true
+        echo "✅ Will configure for existing monitoring stack"
+    else
+        echo "Would you like to install a new Prometheus/Grafana monitoring stack? (Y/n)"
+        read -r INSTALL_NEW
+        if [ "${INSTALL_NEW,,}" != "n" ] && [ "${INSTALL_NEW,,}" != "no" ]; then
+            ENABLE_MONITORING=true
+            echo "✅ Will install new monitoring stack"
+        else
+            echo "✅ Will skip monitoring installation"
+        fi
+    fi
+fi
+
+# Interactive domain setup if not specified
+if [ "$INTERACTIVE" = true ] && [ -z "$DOMAIN" ] && [ "$SKIP_SSL" = false ]; then
+    echo ""
+    echo "🔐 SSL/Domain Setup"
+    echo "=================="
+    echo "Do you want to configure SSL/HTTPS with a domain name? (Y/n)"
+    read -r SETUP_SSL
+    
+    if [ "${SETUP_SSL,,}" != "n" ] && [ "${SETUP_SSL,,}" != "no" ]; then
+        echo "Enter your domain name (e.g., gateway.example.com):"
+        read -r DOMAIN
+        
+        if [ -n "$DOMAIN" ]; then
+            echo "Enter your email for SSL certificate notifications:"
+            read -r EMAIL
+            
+            if [ -z "$EMAIL" ]; then
+                echo "⚠️  Email is required for SSL certificates. Skipping SSL setup."
+                DOMAIN=""
+                SKIP_SSL=true
+            fi
+        else
+            SKIP_SSL=true
+        fi
+    else
+        SKIP_SSL=true
+    fi
+fi
+
+echo ""
 echo "Configuration:"
 echo "  Monitoring: $ENABLE_MONITORING"
+echo "  Use existing monitoring: $USE_EXISTING_MONITORING"
 echo "  Skip build: $SKIP_BUILD"
 echo "  Domain: ${DOMAIN:-'Not set (HTTP only)'}"
 echo "  Email: ${EMAIL:-'Not set'}"
@@ -91,6 +161,8 @@ apt-get install -y \
     nginx \
     certbot \
     python3-certbot-nginx \
+    fail2ban \
+    ufw \
     logrotate \
     curl \
     jq \
@@ -138,7 +210,13 @@ fi
 
 # Step 3: Setup systemd service
 echo "⚙️  Setting up systemd service..."
-./scripts/setup_systemd.sh $([ "$ENABLE_MONITORING" = true ] && echo "--with-monitoring")
+MONITORING_FLAG=""
+if [ "$ENABLE_MONITORING" = true ] && [ "$USE_EXISTING_MONITORING" = false ]; then
+    MONITORING_FLAG="--with-monitoring"
+elif [ "$USE_EXISTING_MONITORING" = true ]; then
+    MONITORING_FLAG="--use-existing-monitoring"
+fi
+./scripts/setup_systemd.sh $MONITORING_FLAG
 
 # Step 4: Configure Redis
 echo "🔧 Optimizing Redis configuration..."
@@ -308,34 +386,179 @@ else
     fi
 fi
 
-# Step 8: Configure firewall
-echo "🔒 Configuring firewall..."
+# Step 8: Configure comprehensive firewall
+echo "🔒 Configuring comprehensive firewall..."
 if command -v ufw &> /dev/null; then
-    # Allow SSH
-    ufw allow ssh
+    # Reset UFW to defaults
+    echo "Resetting UFW to defaults..."
+    ufw --force reset
     
-    # Allow HTTP/HTTPS
-    ufw allow 80/tcp
-    ufw allow 443/tcp
+    # Set default policies
+    ufw default deny incoming
+    ufw default allow outgoing
     
-    # Allow monitoring ports (only from localhost)
+    # Allow SSH with rate limiting
+    ufw limit ssh/tcp comment "SSH with rate limiting"
+    
+    # Allow HTTP/HTTPS with rate limiting
+    ufw limit 80/tcp comment "HTTP with rate limiting"
+    ufw limit 443/tcp comment "HTTPS with rate limiting"
+    
+    # Configure monitoring ports based on setup
     if [ "$ENABLE_MONITORING" = true ]; then
-        ufw allow from 127.0.0.1 to any port 9090  # Prometheus
-        ufw allow from 127.0.0.1 to any port 3000  # Grafana
-        ufw allow from 127.0.0.1 to any port 9100  # Node Exporter
+        # New monitoring stack - localhost only
+        ufw allow from 127.0.0.1 to any port 9090 comment "Prometheus (localhost)"
+        ufw allow from 127.0.0.1 to any port 3000 comment "Grafana (localhost)"
+        ufw allow from 127.0.0.1 to any port 9100 comment "Node Exporter (localhost)"
+        echo "📊 Monitoring ports configured for localhost access only"
+    elif [ "$USE_EXISTING_MONITORING" = true ]; then
+        # Existing monitoring stack - allow external access
+        ufw allow 9090/tcp comment "Prometheus for existing monitoring"
+        ufw allow 3000/tcp comment "Grafana for existing monitoring"
+        ufw allow 9100/tcp comment "Node Exporter for existing monitoring"
+        ufw allow 9877/tcp comment "Gateway metrics for existing monitoring"
+        echo "📊 Monitoring ports opened for external monitoring server"
     fi
     
-    # Enable firewall (only if not already enabled)
-    if ! ufw status | grep -q "Status: active"; then
-        echo "y" | ufw enable
-    fi
+    # Allow Redis only from localhost (security)
+    ufw allow from 127.0.0.1 to any port 6379 comment "Redis (localhost only)"
     
-    echo "✅ Firewall configured"
+    # Block common attack vectors
+    ufw deny 23/tcp comment "Block Telnet"
+    ufw deny 135/tcp comment "Block RPC"
+    ufw deny 445/tcp comment "Block SMB"
+    ufw deny 1433/tcp comment "Block MSSQL"
+    ufw deny 3389/tcp comment "Block RDP"
+    
+    # Enable logging for security monitoring
+    ufw logging medium
+    
+    # Enable UFW
+    echo "Enabling UFW firewall..."
+    ufw --force enable
+    
+    # Show final status
+    echo "📋 Firewall Status:"
+    ufw status numbered
+    
+    echo "✅ Comprehensive firewall configured"
 else
-    echo "⚠️  UFW not available, skipping firewall configuration"
+    echo "❌ UFW not available, firewall configuration failed"
+    echo "Please install ufw: apt-get install -y ufw"
+    exit 1
 fi
 
-# Step 9: Create maintenance scripts
+# Step 9: Configure fail2ban
+echo "🛡️  Configuring fail2ban..."
+
+# Configure fail2ban for nginx and SSH protection
+cat > /etc/fail2ban/jail.local << 'EOF'
+[DEFAULT]
+# Ban hosts for 1 hour (3600 seconds)
+bantime = 3600
+
+# A host is banned if it has generated "maxretry" during the last "findtime" seconds
+findtime = 600
+maxretry = 5
+
+# Email settings (optional)
+# destemail = your@email.com
+# sendername = Fail2Ban
+# action = %(action_mwl)s
+
+[sshd]
+enabled = true
+port = ssh
+logpath = /var/log/auth.log
+bantime = 3600
+maxretry = 3
+
+[nginx-http-auth]
+enabled = true
+port = http,https
+logpath = /var/log/nginx/error.log
+bantime = 3600
+maxretry = 6
+
+[nginx-noscript]
+enabled = true
+port = http,https
+logpath = /var/log/nginx/access.log
+bantime = 3600
+maxretry = 6
+
+[nginx-badbots]
+enabled = true
+port = http,https
+logpath = /var/log/nginx/access.log
+bantime = 86400
+maxretry = 2
+
+[nginx-noproxy]
+enabled = true
+port = http,https
+logpath = /var/log/nginx/access.log
+bantime = 3600
+maxretry = 2
+
+[nginx-limit-req]
+enabled = true
+port = http,https
+logpath = /var/log/nginx/error.log
+bantime = 3600
+maxretry = 10
+EOF
+
+# Create custom filter for torrent gateway specific attacks
+cat > /etc/fail2ban/filter.d/torrent-gateway.conf << 'EOF'
+[Definition]
+# Fail regex for torrent gateway API abuse
+failregex = ^<HOST> .* "(?:GET|POST) /api/.* HTTP/.*" 429 .*$
+            ^<HOST> .* "(?:GET|POST) /api/upload.* HTTP/.*" 413 .*$
+            ^<HOST> .* ".*" 4[0-9][0-9] .*$
+
+# Ignore successful requests
+ignoreregex = ^<HOST> .* "(?:GET|POST) .* HTTP/.*" 2[0-9][0-9] .*$
+EOF
+
+# Add torrent gateway jail
+cat >> /etc/fail2ban/jail.local << 'EOF'
+
+[torrent-gateway]
+enabled = true
+port = http,https
+logpath = /var/log/nginx/access.log
+filter = torrent-gateway
+bantime = 1800
+maxretry = 15
+EOF
+
+# Configure fail2ban to work with UFW
+cat > /etc/fail2ban/action.d/ufw.conf << 'EOF'
+[Definition]
+actionstart =
+actionstop =
+actioncheck =
+actionban = ufw insert 1 deny from <ip> to any comment "fail2ban <name>"
+actionunban = ufw --force delete deny from <ip> to any
+EOF
+
+# Update fail2ban to use UFW action
+sed -i 's/banaction = iptables-multiport/banaction = ufw/' /etc/fail2ban/jail.local
+
+# Enable and start fail2ban
+systemctl enable fail2ban
+systemctl restart fail2ban
+
+# Wait a moment for fail2ban to start
+sleep 3
+
+echo "📋 Fail2ban Status:"
+fail2ban-client status
+
+echo "✅ Fail2ban configured with nginx and SSH protection"
+
+# Step 10: Create maintenance scripts
 echo "🛠️  Creating maintenance scripts..."
 
 # Create backup cron job
@@ -438,6 +661,10 @@ if [ $? -eq 0 ]; then
     if [ "$ENABLE_MONITORING" = true ]; then
         echo "   Prometheus: http://localhost:9090"
         echo "   Grafana: http://localhost:3000 (admin/admin)"
+    elif [ "$USE_EXISTING_MONITORING" = true ]; then
+        echo "   Node Exporter: http://localhost:9100/metrics (for your Prometheus)"
+        echo "   Gateway Metrics: http://localhost:9877/metrics"
+        echo "   Via nginx: http://localhost/node-metrics"
     fi
     echo ""
     echo "🔧 Management Commands:"
@@ -457,6 +684,11 @@ if [ $? -eq 0 ]; then
     echo "   System logs: sudo tail -f /var/log/syslog"
     echo "   Health:      sudo /opt/torrent-gateway/scripts/health_check.sh"
     echo ""
+    echo "🛡️  Security Features Enabled:"
+    echo "   UFW Firewall: sudo ufw status"
+    echo "   Fail2ban:     sudo fail2ban-client status"
+    echo "   SSL Certs:    sudo certbot certificates"
+    echo ""
     if [ -n "$DOMAIN" ]; then
         echo "🔐 SSL Certificate:"
         echo "   Status:      sudo certbot certificates"
diff --git a/scripts/setup_systemd.sh b/scripts/setup_systemd.sh
index c3112c8..0f68e0e 100755
--- a/scripts/setup_systemd.sh
+++ b/scripts/setup_systemd.sh
@@ -23,15 +23,20 @@ fi
 
 # Parse command line arguments
 ENABLE_MONITORING=false
+USE_EXISTING_MONITORING=false
 while [[ $# -gt 0 ]]; do
     case $1 in
         --with-monitoring)
             ENABLE_MONITORING=true
             shift
             ;;
+        --use-existing-monitoring)
+            USE_EXISTING_MONITORING=true
+            shift
+            ;;
         *)
             echo "Unknown option: $1"
-            echo "Usage: $0 [--with-monitoring]"
+            echo "Usage: $0 [--with-monitoring|--use-existing-monitoring]"
             exit 1
             ;;
     esac
@@ -154,28 +159,48 @@ cat > /etc/logrotate.d/torrent-gateway << 'EOF'
 }
 EOF
 
-# Create nginx configuration
+# Create enhanced nginx configuration
 echo "🌐 Configuring nginx..."
 cat > /etc/nginx/sites-available/torrent-gateway << 'EOF'
+# Rate limiting zones
+limit_req_zone $binary_remote_addr zone=api:10m rate=10r/s;
+limit_req_zone $binary_remote_addr zone=upload:10m rate=1r/s;
+
+# Upstreams
 upstream torrent_gateway {
     server 127.0.0.1:9877 max_fails=3 fail_timeout=30s;
     keepalive 32;
 }
 
+upstream prometheus {
+    server 127.0.0.1:9090 max_fails=3 fail_timeout=30s;
+}
+
+upstream grafana {
+    server 127.0.0.1:3000 max_fails=3 fail_timeout=30s;
+}
+
 server {
     listen 80;
     server_name _;
     
-    client_max_body_size 5G;
+    # Large file upload support
+    client_max_body_size 10G;
     client_body_timeout 300s;
+    client_header_timeout 60s;
     proxy_request_buffering off;
     
-    # Security headers
-    add_header X-Content-Type-Options nosniff;
-    add_header X-Frame-Options DENY;
-    add_header X-XSS-Protection "1; mode=block";
+    # Enhanced security headers
+    add_header X-Content-Type-Options nosniff always;
+    add_header X-Frame-Options SAMEORIGIN always;
+    add_header X-XSS-Protection "1; mode=block" always;
+    add_header Referrer-Policy "strict-origin-when-cross-origin" always;
+    add_header Content-Security-Policy "default-src 'self' 'unsafe-inline' 'unsafe-eval' data: blob:; connect-src 'self' wss: ws:;" always;
     
+    # Main application
     location / {
+        limit_req zone=api burst=20 nodelay;
+        
         proxy_pass http://torrent_gateway;
         proxy_http_version 1.1;
         proxy_set_header Upgrade $http_upgrade;
@@ -186,19 +211,94 @@ server {
         proxy_set_header X-Forwarded-Proto $scheme;
         proxy_cache_bypass $http_upgrade;
         
-        # Timeouts for large file uploads and streaming
+        # Enhanced timeouts for large operations
         proxy_connect_timeout 60s;
-        proxy_send_timeout 300s;
-        proxy_read_timeout 300s;
+        proxy_send_timeout 600s;
+        proxy_read_timeout 600s;
         proxy_buffering off;
     }
     
-    # Health check endpoint (bypass proxy for local checks)
+    # Upload endpoints with stricter rate limiting
+    location ~ ^/api/(upload|files) {
+        limit_req zone=upload burst=5 nodelay;
+        
+        proxy_pass http://torrent_gateway;
+        proxy_http_version 1.1;
+        proxy_set_header Host $host;
+        proxy_set_header X-Real-IP $remote_addr;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+        proxy_set_header X-Forwarded-Proto $scheme;
+        
+        # Extended timeouts for uploads
+        proxy_connect_timeout 60s;
+        proxy_send_timeout 1800s;  # 30 minutes
+        proxy_read_timeout 1800s;  # 30 minutes
+        proxy_buffering off;
+    }
+    
+    # Prometheus endpoint (conditional)
+    location /prometheus/ {
+        auth_basic "Monitoring";
+        auth_basic_user_file /etc/nginx/.htpasswd;
+        
+        proxy_pass http://prometheus/;
+        proxy_set_header Host $host;
+        proxy_set_header X-Real-IP $remote_addr;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+        proxy_set_header X-Forwarded-Proto $scheme;
+    }
+    
+    # Grafana endpoint (conditional)
+    location /grafana/ {
+        proxy_pass http://grafana/;
+        proxy_set_header Host $host;
+        proxy_set_header X-Real-IP $remote_addr;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+        proxy_set_header X-Forwarded-Proto $scheme;
+        
+        # WebSocket support for Grafana live features
+        proxy_http_version 1.1;
+        proxy_set_header Upgrade $http_upgrade;
+        proxy_set_header Connection "upgrade";
+    }
+    
+    # Health check endpoint
     location /health {
         access_log off;
-        return 200 "healthy\n";
-        add_header Content-Type text/plain;
+        proxy_pass http://torrent_gateway/api/health;
+        proxy_set_header Host $host;
     }
+    
+    # Node exporter metrics (for existing monitoring)
+    location /node-metrics {
+        proxy_pass http://127.0.0.1:9100/metrics;
+        proxy_set_header Host $host;
+        access_log off;
+    }
+    
+    # Deny access to sensitive files
+    location ~ /\. {
+        deny all;
+        access_log off;
+        log_not_found off;
+    }
+    
+    # Enable gzip compression
+    gzip on;
+    gzip_vary on;
+    gzip_min_length 1024;
+    gzip_proxied any;
+    gzip_comp_level 6;
+    gzip_types
+        text/plain
+        text/css
+        text/xml
+        text/javascript
+        application/json
+        application/javascript
+        application/xml+rss
+        application/atom+xml
+        image/svg+xml;
 }
 EOF
 
@@ -212,6 +312,65 @@ nginx -t
 # Install monitoring stack if requested
 if [ "$ENABLE_MONITORING" = true ]; then
     echo "📊 Installing monitoring stack..."
+elif [ "$USE_EXISTING_MONITORING" = true ]; then
+    echo "📊 Configuring for existing monitoring stack..."
+    
+    # Install Node Exporter for system metrics
+    NODE_EXPORTER_VERSION="1.7.0"
+    cd /tmp
+    wget "https://github.com/prometheus/node_exporter/releases/download/v${NODE_EXPORTER_VERSION}/node_exporter-${NODE_EXPORTER_VERSION}.linux-amd64.tar.gz"
+    tar -xzf "node_exporter-${NODE_EXPORTER_VERSION}.linux-amd64.tar.gz"
+    
+    mkdir -p /opt/node_exporter
+    cp "node_exporter-${NODE_EXPORTER_VERSION}.linux-amd64/node_exporter" /opt/node_exporter/
+    
+    # Create node_exporter systemd service
+    cat > /etc/systemd/system/node-exporter.service << 'EOF'
+[Unit]
+Description=Node Exporter
+After=network.target
+
+[Service]
+Type=simple
+User=nobody
+Group=nogroup
+ExecStart=/opt/node_exporter/node_exporter --web.listen-address=:9100
+Restart=always
+RestartSec=5
+
+[Install]
+WantedBy=multi-user.target
+EOF
+    
+    systemctl daemon-reload
+    systemctl enable node-exporter
+    systemctl start node-exporter
+    
+    echo "✅ Node Exporter configured for existing monitoring"
+    echo ""
+    echo "📋 Integration Instructions:"
+    echo "Add the following to your existing Prometheus configuration:"
+    echo ""
+    echo "scrape_configs:"
+    echo "  - job_name: 'torrent-gateway-app'"
+    echo "    static_configs:"
+    echo "      - targets: ['$(curl -s https://api.ipify.org || echo 'YOUR_SERVER_IP'):9877']"
+    echo "    metrics_path: '/metrics'"
+    echo "    scrape_interval: 30s"
+    echo ""
+    echo "  - job_name: 'torrent-gateway-system'"
+    echo "    static_configs:"
+    echo "      - targets: ['$(curl -s https://api.ipify.org || echo 'YOUR_SERVER_IP'):9100']"
+    echo "    scrape_interval: 30s"
+    echo ""
+    echo "Monitoring endpoints available at:"
+    echo "  - Gateway metrics: http://$(curl -s https://api.ipify.org || echo 'YOUR_SERVER_IP'):9877/metrics"
+    echo "  - System metrics: http://$(curl -s https://api.ipify.org || echo 'YOUR_SERVER_IP'):9100/metrics"
+    echo "  - Via nginx: http://$(curl -s https://api.ipify.org || echo 'YOUR_SERVER_IP')/node-metrics"
+    echo ""
+fi
+
+if [ "$ENABLE_MONITORING" = true ]; then
     
     # Install Prometheus
     PROMETHEUS_VERSION="2.48.0"