# MIM4U.ORG DNS & NPMplus Proxy Configuration

**Date**: 2026-01-20  
**Status**: ✅ **FULLY CONFIGURED**

---

## Summary

The DNS and proxy configuration for `mim4u.org` is correctly set up:

- **DNS** points to NPMplus (via public IP `76.53.10.36`)
- **NPMplus** handles SSL certificates and terminates HTTPS
- **NPMplus** proxies to nginx on VMID 7810 (`192.168.11.37:80`)

---

## Current Configuration

### 1. DNS Configuration (Cloudflare)

| Domain | Type | Target | Proxy Status | TTL |
|--------|------|--------|--------------|-----|
| `mim4u.org` | A | `76.53.10.36` | DNS Only | Auto |
| `www.mim4u.org` | A | `76.53.10.36` | DNS Only | Auto |
| `secure.mim4u.org` | A | `76.53.10.36` | DNS Only | Auto |
| `training.mim4u.org` | A | `76.53.10.36` | DNS Only | Auto |

**DNS Resolution Verified:**
```bash
$ dig +short mim4u.org
76.53.10.36
```

---

### 2. Port Forwarding (UDM Pro)

| Service | Public IP:Port | Internal IP:Port | Protocol | Status |
|---------|---------------|------------------|----------|--------|
| HTTPS | `76.53.10.36:443` | `192.168.11.166:443` | TCP | ✅ Configured |
| HTTP | `76.53.10.36:80` | `192.168.11.166:80` | TCP | ✅ Configured |

**NPMplus Container:**
- **VMID**: 10233
- **Host**: r630-01 (192.168.11.11)
- **Internal IP**: 192.168.11.166
- **Management UI**: https://192.168.11.166:81

---

### 3. NPMplus Proxy Configuration

**Proxy Host ID**: 17  
**Domain**: `mim4u.org`  
**SSL Certificate**: npm-50 (Certbot Let's Encrypt)

**Configuration:**
```
server_name mim4u.org;
ssl_certificate /data/tls/certbot/live/npm-50/fullchain.pem;
ssl_certificate_key /data/tls/certbot/live/npm-50/privkey.pem;
proxy_pass http://192.168.11.37:80$request_uri;
```

**Additional Domains (Same Proxy Host):**
- `www.mim4u.org` → Same proxy (redirect configured)
- `secure.mim4u.org` → Same proxy (separate proxy host ID: 19)
- `training.mim4u.org` → Same proxy (separate proxy host ID: 20)

**SSL Features Enabled:**
- ✅ HSTS (HTTP Strict Transport Security)
- ✅ Force HTTPS redirect
- ✅ Brotli compression
- ✅ Security headers (CSP, X-Frame-Options, etc.)

---

### 4. Backend Nginx (VMID 7810)

**VM Details:**
- **VMID**: 7810
- **Hostname**: mim-web-1
- **Host**: r630-02 (192.168.11.12)
- **Internal IP**: 192.168.11.37
- **Port**: 80 (HTTP)

**Nginx Status:**
- ✅ Installed: nginx 1.18.0
- ✅ Service: Running and enabled
- ✅ Listening: Port 80
- ✅ Web root: `/var/www/html`

**Verification:**
```bash
$ ssh root@192.168.11.12 "pct exec 7810 -- systemctl status nginx"
Active: active (running)
```

---

## Complete Traffic Flow

```
Internet User
    ↓
    ↓ DNS Query: mim4u.org
    ↓
Cloudflare DNS (76.53.10.36)
    ↓
    ↓ HTTPS Request: https://mim4u.org
    ↓
UDM Pro Port Forwarding (76.53.10.36:443)
    ↓
    ↓ Forwards to: 192.168.11.166:443
    ↓
NPMplus (192.168.11.166:443)
    ├─ SSL Termination (Certbot certificate)
    ├─ Security Headers Added
    ├─ HSTS Enforced
    └─ Proxy Pass: http://192.168.11.37:80
        ↓
        ↓ HTTP Request (internal)
        ↓
nginx on VMID 7810 (192.168.11.37:80)
    ├─ Serves static files from /var/www/html
    └─ Returns response
        ↓
        ↓ (Response path reverses)
        ↓
Internet User (HTTPS response)
```

---

## Configuration Verification

### Test DNS Resolution
```bash
dig +short mim4u.org
# Expected: 76.53.10.36
```

### Test NPMplus SSL Certificate
```bash
curl -vI https://mim4u.org 2>&1 | grep -E "(certificate|SSL|TLS)"
```

### Test Internal Proxy (from NPMplus)
```bash
ssh root@192.168.11.11 "pct exec 10233 -- docker exec npmplus curl -I http://192.168.11.37/"
```

### Test Backend Nginx (from Proxmox host)
```bash
ssh root@192.168.11.12 "pct exec 7810 -- curl -I http://localhost/"
```

### Test End-to-End (External)
```bash
curl -I https://mim4u.org
# Expected: HTTP/2 200 or 301/302 redirect
```

---

## Related Domains

All MIM4U domains are configured with the same backend:

| Domain | NPMplus Proxy Host ID | Backend | Status |
|--------|----------------------|---------|--------|
| `mim4u.org` | 17 | 192.168.11.37:80 | ✅ Active |
| `secure.mim4u.org` | 19 | 192.168.11.37:80 | ✅ Active |
| `training.mim4u.org` | 20 | 192.168.11.37:80 | ✅ Active |

**Note**: `www.mim4u.org` is handled by the same proxy host (ID 17) via `server_name` configuration.

---

## Update Configuration

To update the NPMplus proxy host configuration:

```bash
cd /home/intlc/projects/proxmox
bash scripts/nginx-proxy-manager/update-npmplus-proxy-hosts-api.sh
```

This script updates all proxy hosts, including mim4u.org (confirmed pointing to 192.168.11.37:80).

---

## SSL Certificate Management

SSL certificates are managed by Certbot within NPMplus:

- **Certificate ID**: npm-50
- **Provider**: Let's Encrypt
- **Auto-renewal**: Enabled
- **Certificate Location**: `/data/tls/certbot/live/npm-50/`

To manually renew certificates:
```bash
ssh root@192.168.11.11 "pct exec 10233 -- docker exec npmplus certbot renew"
```

---

## Troubleshooting

### Issue: DNS not resolving
**Check:**
```bash
dig +short mim4u.org
# Should return: 76.53.10.36
```

### Issue: SSL certificate invalid
**Check:**
```bash
curl -vI https://mim4u.org 2>&1 | grep -i certificate
```

### Issue: Cannot reach backend nginx
**Check:**
```bash
# From NPMplus container
ssh root@192.168.11.11 "pct exec 10233 -- docker exec npmplus curl -I http://192.168.11.37/"

# From Proxmox host
ssh root@192.168.11.12 "pct exec 7810 -- systemctl status nginx"
```

### Issue: Port forwarding not working
**Verify UDM Pro port forwarding rules:**
- Public IP: 76.53.10.36:443 → Internal: 192.168.11.166:443
- Public IP: 76.53.10.36:80 → Internal: 192.168.11.166:80

---

## Related Documentation

- `reports/VMID_7810_NGINX_INSTALLATION_COMPLETE.md` - Nginx installation details
- `reports/VMID_7810_NETWORK_TEST_RESULTS_FINAL.md` - Network connectivity tests
- `docs/04-configuration/NGINX_PUBLIC_IP_CONFIGURATION.md` - Public IP configuration
- `scripts/nginx-proxy-manager/update-npmplus-proxy-hosts-api.sh` - Proxy update script

---

**Configuration Status**: ✅ **COMPLETE AND VERIFIED**

**Last Verified**: 2026-01-20