# RPC Endpoint Diagnostics Report
**Date**: 2025-12-27 00:16 UTC  
**Endpoint**: `https://rpc-http-pub.d-bis.org`

---

## Executive Summary

✅ **PUBLIC ENDPOINT IS OPERATIONAL**

The RPC endpoint is working correctly. All components are healthy and responding as expected.

---

## Component Status

### ✅ VMID 2502 (besu-rpc-3) - OPERATIONAL

**Container Status:**
- Status: Running
- IP: 192.168.11.252
- Hostname: besu-rpc-3
- Uptime: 4 days, 16 hours, 35 minutes
- Load Average: 6.90, 3.95, 3.49

**Services:**
- ✅ **besu-rpc.service**: Active (running) - 6+ hours uptime
- ✅ **nginx.service**: Active (running) - 4+ days uptime

**Listening Ports:**
- ✅ Port 443 (HTTPS) - Nginx
- ✅ Port 80 (HTTP) - Nginx  
- ✅ Port 8545 (RPC HTTP) - Besu
- ✅ Port 30303 (P2P) - Besu
- ✅ Port 9545 (Metrics) - Besu

**System Resources:**
- Memory: 16GB total, 3.2GB used, 12GB available (20% usage)
- Disk: 196GB total, 2.7GB used, 184GB available (2% usage)
- Swap: 512MB (unused)

**RPC Functionality:**
- ✅ Chain ID: `0x8a` (138 decimal) - CORRECT
- ✅ Block Number: ~262,700+ (syncing actively)
- ✅ Peer Count: 3 peers connected
- ✅ Sync Status: Fully synced (false)
- ✅ Direct RPC access: WORKING
- ✅ Nginx proxy: WORKING
- ✅ Network access: WORKING

**Nginx Configuration:**
- ✅ Configuration syntax: OK
- ✅ SSL certificates: Configured
- ✅ Server name: `rpc-http-pub.d-bis.org`
- ✅ Proxy to: `127.0.0.1:8545`
- ✅ Cloudflare IPs: Trusted for real IP

---

### ✅ Cloudflared Tunnel (VMID 102) - OPERATIONAL

**Container Status:**
- Status: Running
- Host: 192.168.11.12 (pve2)
- Storage: thin1:vm-102-disk-0,size=2G

**Services Running:**
- ✅ cloudflared.service (main service with token)
- ✅ cloudflared-ml110.service
- ✅ cloudflared-r630-01.service
- ✅ cloudflared-r630-02.service

**Configuration:**
- Main service uses token-based authentication
- RPC endpoints are configured via Cloudflare Dashboard/API
- Tunnel is routing traffic correctly to `192.168.11.252:443`

---

### ✅ Public Endpoint - OPERATIONAL

**URL**: `https://rpc-http-pub.d-bis.org`

**Test Results:**
```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "result": "0x8a"
}
```

**Status**: ✅ **WORKING CORRECTLY**

**Response Time**: < 1 second
**SSL**: Valid certificate
**HTTP Version**: HTTP/2

---

## Network Flow

```
Internet Client
  ↓
Cloudflare DNS (rpc-http-pub.d-bis.org)
  ↓
Cloudflare Edge (SSL termination, DDoS protection)
  ↓
Cloudflare Tunnel (encrypted)
  ↓
VMID 102: cloudflared.service (192.168.11.12)
  ↓
VMID 2502: Nginx (192.168.11.252:443)
  ↓
VMID 2502: Besu RPC (127.0.0.1:8545)
  ↓
Response: {"jsonrpc":"2.0","id":1,"result":"0x8a"}
```

---

## Test Commands

### Test Public Endpoint
```bash
curl -X POST https://rpc-http-pub.d-bis.org \
  -H "Content-Type: application/json" \
  -d '{"jsonrpc":"2.0","method":"eth_chainId","params":[],"id":1}'
```

**Expected Response:**
```json
{"jsonrpc":"2.0","id":1,"result":"0x8a"}
```

### Test Direct Network Access
```bash
curl -k -X POST https://192.168.11.252:443 \
  -H "Host: rpc-http-pub.d-bis.org" \
  -H "Content-Type: application/json" \
  -d '{"jsonrpc":"2.0","method":"eth_chainId","params":[],"id":1}'
```

### Test Internal RPC
```bash
ssh root@192.168.11.10 "pct exec 2502 -- curl -s -X POST http://127.0.0.1:8545 \
  -H 'Content-Type: application/json' \
  -d '{\"jsonrpc\":\"2.0\",\"method\":\"eth_chainId\",\"params\":[],\"id\":1}'"
```

---

## Health Checks

### VMID 2502 Service Status
```bash
ssh root@192.168.11.10 "pct exec 2502 -- systemctl status besu-rpc nginx"
```

### VMID 2502 Resource Usage
```bash
ssh root@192.168.11.10 "pct exec 2502 -- free -h && df -h /"
```

### Cloudflared Tunnel Status
```bash
ssh root@192.168.11.12 "pct exec 102 -- systemctl status cloudflared.service"
```

### Check Recent Logs
```bash
# Besu logs
ssh root@192.168.11.10 "pct exec 2502 -- journalctl -u besu-rpc -n 50"

# Nginx logs
ssh root@192.168.11.10 "pct exec 2502 -- tail -20 /var/log/nginx/error.log"

# Cloudflared logs
ssh root@192.168.11.12 "pct exec 102 -- journalctl -u cloudflared.service -n 50"
```

---

## Recommendations

### Current Status: ✅ All Systems Operational

No immediate action required. All components are functioning correctly.

### Monitoring Recommendations

1. **Monitor Besu Sync Status**
   - Check block height periodically
   - Ensure peer count stays above 2

2. **Monitor Resource Usage**
   - Memory usage is healthy (20%)
   - Disk usage is minimal (2%)
   - Load average is acceptable

3. **Monitor Nginx Logs**
   - Watch for error patterns
   - Monitor access patterns

4. **Monitor Cloudflared Tunnel**
   - Ensure service stays running
   - Check for connection errors

### Optional Improvements

1. Set up automated health checks
2. Configure alerting for service failures
3. Monitor RPC response times
4. Track API usage patterns

---

## Troubleshooting Reference

### If Public Endpoint Fails

1. Check VMID 2502 container status
2. Check Besu RPC service
3. Check Nginx service
4. Check Cloudflared tunnel service (VMID 102)
5. Test direct network access to 192.168.11.252:443
6. Test internal RPC on 127.0.0.1:8545

### Common Issues

- **Error 1033/530**: Cloudflared tunnel not running or misconfigured
- **Connection refused**: Service not running or firewall blocking
- **Wrong chain ID**: Besu configuration issue
- **SSL errors**: Certificate expiration or misconfiguration

---

**Last Updated**: 2025-12-27 00:16 UTC  
**Status**: ✅ ALL SYSTEMS OPERATIONAL