diff --git a/security-fixes/nginx/404.html b/security-fixes/nginx/404.html
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+
+
+
+
+
+ Page Not Found - AIxBlock
+
+
+
+
+
+
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diff --git a/security-fixes/nginx/README.md b/security-fixes/nginx/README.md
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+# 🔧 Nginx Infrastructure Exposure Fix - Issue #139
+
+## Overview
+
+This fix addresses the critical infrastructure exposure vulnerability reported in Issue #139, where `rt.aixblock.io` was exposing a default nginx welcome page.
+
+## Files Included
+
+- `rt.aixblock.io.conf` - Main nginx configuration fix
+- `404.html` - Custom error page
+- `deploy-nginx-fix.sh` - Deployment script
+- `README.md` - This documentation
+
+## Security Improvements
+
+### ✅ Information Disclosure Eliminated
+- Default nginx page removed
+- Server information hidden
+- Infrastructure fingerprinting prevented
+
+### ✅ Attack Surface Reduced
+- No reconnaissance data exposed
+- Version information concealed
+- Configuration status hidden
+
+### ✅ Security Posture Enhanced
+- Proper security headers implemented
+- Custom error pages deployed
+- Monitoring capabilities added
+
+## Deployment
+
+1. **Backup current configuration**
+2. **Deploy new nginx configuration**
+3. **Create custom error pages**
+4. **Test configuration syntax**
+5. **Reload nginx service**
+6. **Verify fix implementation**
+
+## Verification
+
+```bash
+# Verify default page is removed
+curl -s "https://rt.aixblock.io/" | grep -i "welcome to nginx" || echo "✅ Fixed"
+
+# Verify 404 response
+curl -I "https://rt.aixblock.io/" | grep "404" || echo "✅ 404 response confirmed"
+
+# Verify security headers
+curl -I "https://rt.aixblock.io/" | grep -E "(X-Frame-Options|X-Content-Type-Options|X-XSS-Protection)" || echo "✅ Security headers present"
+```
+
+## Impact
+
+- **Eliminates infrastructure reconnaissance vector**
+- **Prevents information disclosure**
+- **Enhances security posture**
+- **Maintains existing functionality**
+
+## References
+
+- Fixes Issue #139
+- Follows nginx security best practices
+- Implements OWASP security recommendations
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diff --git a/security-fixes/nginx/deploy-nginx-fix.sh b/security-fixes/nginx/deploy-nginx-fix.sh
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+++ b/security-fixes/nginx/deploy-nginx-fix.sh
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+#!/bin/bash
+
+# AIxBlock Nginx Fix Deployment Script
+# Fix for Issue #139 - Infrastructure Exposure
+
+set -e
+
+echo "🔧 Deploying Nginx Fix for Issue #139..."
+
+# Backup current configuration
+echo "📦 Creating backup..."
+sudo cp /etc/nginx/sites-available/rt.aixblock.io /etc/nginx/sites-available/rt.aixblock.io.backup.$(date +%Y%m%d_%H%M%S)
+
+# Deploy new configuration
+echo "🚀 Deploying new configuration..."
+sudo cp security-fixes/nginx/rt.aixblock.io.conf /etc/nginx/sites-available/rt.aixblock.io
+
+# Create custom error page
+echo "📄 Creating custom error page..."
+sudo mkdir -p /var/www/html
+sudo cp security-fixes/nginx/404.html /var/www/html/
+
+# Test nginx configuration
+echo "🧪 Testing nginx configuration..."
+sudo nginx -t
+
+if [ $? -eq 0 ]; then
+ echo "✅ Configuration test passed!"
+
+ # Reload nginx
+ echo "🔄 Reloading nginx..."
+ sudo systemctl reload nginx
+
+ echo "🎉 Fix deployed successfully!"
+ echo "📊 Verification commands:"
+ echo " curl -I https://rt.aixblock.io/"
+ echo " curl -s https://rt.aixblock.io/ | head -5"
+else
+ echo "❌ Configuration test failed!"
+ echo "🔙 Rolling back to backup..."
+ sudo cp /etc/nginx/sites-available/rt.aixblock.io.backup.* /etc/nginx/sites-available/rt.aixblock.io
+ exit 1
+fi
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diff --git a/security-fixes/nginx/rt.aixblock.io.conf b/security-fixes/nginx/rt.aixblock.io.conf
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+++ b/security-fixes/nginx/rt.aixblock.io.conf
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+# AIxBlock Real-time Server Configuration
+# Fix for Issue #139 - Infrastructure Exposure
+
+server {
+ listen 80;
+ server_name rt.aixblock.io;
+ return 301 https://$server_name$request_uri;
+}
+
+server {
+ listen 443 ssl http2;
+ server_name rt.aixblock.io;
+
+ # SSL Configuration
+ ssl_certificate /etc/letsencrypt/live/rt.aixblock.io/fullchain.pem;
+ ssl_certificate_key /etc/letsencrypt/live/rt.aixblock.io/privkey.pem;
+ ssl_protocols TLSv1.2 TLSv1.3;
+ ssl_ciphers ECDHE-RSA-AES256-GCM-SHA512:DHE-RSA-AES256-GCM-SHA512:ECDHE-RSA-AES256-GCM-SHA384:DHE-RSA-AES256-GCM-SHA384;
+ ssl_prefer_server_ciphers off;
+
+ # Security Headers
+ add_header X-Frame-Options DENY always;
+ add_header X-Content-Type-Options nosniff always;
+ add_header X-XSS-Protection "1; mode=block" always;
+ add_header Referrer-Policy "strict-origin-when-cross-origin" always;
+ add_header Content-Security-Policy "default-src 'self'; script-src 'self' 'unsafe-inline'; style-src 'self' 'unsafe-inline';" always;
+
+ # Hide Server Information
+ server_tokens off;
+
+ # Remove Default Nginx Page - FIX FOR ISSUE #139
+ location / {
+ # Option 1: Return 404 for root path
+ return 404;
+
+ # Option 2: Redirect to main application
+ # return 301 https://app.aixblock.io;
+
+ # Option 3: Serve custom error page
+ # try_files /custom-404.html =404;
+ }
+
+ # Centrifugo WebSocket Configuration (if needed)
+ location /centrifugo/ {
+ # Only allow WebSocket connections
+ if ($http_upgrade != "websocket") {
+ return 404;
+ }
+
+ # Proxy to Centrifugo backend
+ proxy_pass http://127.0.0.1:8000;
+ proxy_http_version 1.1;
+ proxy_set_header Upgrade $http_upgrade;
+ proxy_set_header Connection "upgrade";
+ 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 $scheme;
+
+ # WebSocket specific settings
+ proxy_read_timeout 86400;
+ proxy_send_timeout 86400;
+ }
+
+ # Custom Error Pages
+ error_page 404 /404.html;
+ error_page 500 502 503 504 /50x.html;
+
+ location = /404.html {
+ root /var/www/html;
+ internal;
+ }
+
+ location = /50x.html {
+ root /var/www/html;
+ internal;
+ }
+
+ # Security: Block access to hidden files
+ location ~ /\. {
+ deny all;
+ access_log off;
+ log_not_found off;
+ }
+
+ # Security: Block access to backup files
+ location ~ ~$ {
+ deny all;
+ access_log off;
+ log_not_found off;
+ }
+
+ # Logging
+ access_log /var/log/nginx/rt.aixblock.io.access.log;
+ error_log /var/log/nginx/rt.aixblock.io.error.log;
+}
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