explorer-monorepo/docs/ERROR_REPORT_AND_FIXES.md

Comprehensive Error Report and Fixes

Generated: $(date)
Status: 🔴 CRITICAL ISSUES FOUND

---

Executive Summary

The log analysis revealed 10 errors and 2 warnings. The primary issue is that the backend API server is not running, which causes all API endpoints to fail.

Critical Issues

1. ❌ Backend API server is not running - All API endpoints return HTTP 000 (connection refused)
2. ❌ Local API endpoints inaccessible - /api/v2/stats, /api/v1/blocks, /api/v1/transactions all failing
3. ⚠️ DNS resolution issue for explorer.d-bis.org (but HTTPS works, so likely tool issue)

Working Components

1. ✅ RPC connectivity - ChainID 138 RPC is accessible (block 148937)
2. ✅ Blockscout API - Both blocks and transactions endpoints working
3. ✅ Frontend files - All configuration correct (ethers, Blockscout API, ChainID 138)
4. ✅ HTTPS connectivity - explorer.d-bis.org is accessible

---

Detailed Error Analysis

1. Backend API Server Not Running ❌

Error: All API endpoints return HTTP 000 (connection refused)

Affected Endpoints:

• /api/v2/stats - Stats endpoint
• /api/v1/blocks - Blocks listing
• /api/v1/transactions - Transactions listing
• /api?module=block&action=eth_block_number - Etherscan-compatible API

Root Cause: The backend Go server (backend/api/rest/main.go) is not running on port 8080.

Impact:

• Frontend cannot load stats, blocks, or transactions from local API
• Explorer shows "Loading..." indefinitely
• Users see errors when trying to use the explorer

Solution:

Option 1: Run Backend Server Directly

cd /home/intlc/projects/proxmox/explorer-monorepo/backend/api/rest

# Set environment variables
export CHAIN_ID=138
export PORT=8080
export DB_HOST=localhost
export DB_PORT=5432
export DB_USER=explorer
export DB_PASSWORD=your_password
export DB_NAME=explorer

# Run the server
go run main.go

Option 2: Build and Run

cd /home/intlc/projects/proxmox/explorer-monorepo/backend/api/rest

# Build
go build -o api-server main.go

# Run
./api-server

Option 3: Create Systemd Service

Create /etc/systemd/system/explorer-api.service:

[Unit]
Description=Explorer API Server
After=network.target postgresql.service

[Service]
Type=simple
User=explorer
WorkingDirectory=/home/intlc/projects/proxmox/explorer-monorepo/backend/api/rest
Environment="CHAIN_ID=138"
Environment="PORT=8080"
Environment="DB_HOST=localhost"
Environment="DB_PORT=5432"
Environment="DB_USER=explorer"
Environment="DB_PASSWORD=your_password"
Environment="DB_NAME=explorer"
ExecStart=/usr/bin/go run main.go
Restart=always
RestartSec=10

[Install]
WantedBy=multi-user.target

Then:

sudo systemctl daemon-reload
sudo systemctl enable explorer-api
sudo systemctl start explorer-api
sudo systemctl status explorer-api

2. Database Configuration Required ⚠️

Issue: Backend requires database connection but configuration may be missing.

Check Database Config:

The backend uses github.com/explorer/backend/database/config. Check:

• backend/database/config/config.go - Database configuration loader
• Environment variables or config file for database credentials

Required Environment Variables:

DB_HOST=localhost          # Database host
DB_PORT=5432              # Database port
DB_USER=explorer          # Database user
DB_PASSWORD=your_password # Database password
DB_NAME=explorer          # Database name

Verify Database Connection:

# Test PostgreSQL connection
psql -h localhost -U explorer -d explorer -c "SELECT 1;"

# Or using connection string
psql "postgresql://explorer:password@localhost:5432/explorer" -c "SELECT 1;"

3. DNS Resolution Issue (Non-Critical) ⚠️

Error: DNS resolution failed for explorer.d-bis.org

Status: HTTPS connectivity works, so this is likely a tool issue (host command may not be available or configured).

Impact: None - the explorer is accessible via HTTPS.

Solution: No action needed. The host command may not be installed or DNS may be configured differently.

---

Frontend Status ✅

Configuration Check

All frontend configurations are correct:

1. ✅ Ethers Library: Properly referenced with CDN fallbacks
2. ✅ Blockscout API: Configured for ChainID 138 (https://explorer.d-bis.org/api)
3. ✅ ChainID 138: Correctly set in frontend code
4. ✅ Error Handling: 16 console.error calls and 26 try-catch blocks found

Frontend API Configuration

The frontend is configured to use:

• API_BASE: /api (relative path, expects backend on same domain)
• Blockscout API: https://explorer.d-bis.org/api (for ChainID 138)
• CHAIN_ID: 138 (Hyperledger Besu)

Note: Since the backend is not running, the frontend will fall back to Blockscout API for ChainID 138, which is working correctly.

---

Blockscout API Status ✅

Blockscout API is fully operational:

1. ✅ Blocks Endpoint: /api/v2/blocks - Working
2. ✅ Transactions Endpoint: /api/v2/transactions - Working

Sample Response (Blocks):

{
  "hash": "0x8009c73dca6df6f8238f312d1620135a2828af0035ab42d00c1d4388752c980e",
  "height": 149477,
  "gas_used": "0",
  "gas_limit": "30000000",
  ...
}

Sample Response (Transactions):

{
  "hash": "0xf63943dda9803d0afdd8c4c9bea990054cd8cf16482da7a4265e0a700828888b",
  "result": "success",
  "type": 2,
  ...
}

---

Network Status ✅

RPC Connectivity

• Status: ✅ Accessible
• Current Block: 148937
• RPC URL: http://192.168.11.250:8545
• Chain ID: 138

HTTPS Connectivity

• Status: ✅ Accessible
• URL: https://explorer.d-bis.org
• Blockscout API: Working correctly

---

Immediate Action Items

Priority 1: Start Backend Server

1. Check database configuration:

   cd /home/intlc/projects/proxmox/explorer-monorepo/backend
   cat database/config/config.go  # Review config
   

2. Set environment variables:

   export CHAIN_ID=138
   export PORT=8080
   export DB_HOST=localhost
   export DB_PORT=5432
   export DB_USER=explorer
   export DB_PASSWORD=your_password
   export DB_NAME=explorer
   

3. Start the server:

   cd backend/api/rest
   go run main.go
   

4. Verify it's running:

   curl http://localhost:8080/health
   curl http://localhost:8080/api/v2/stats
   

Priority 2: Verify Database

1. Check if database exists:

   psql -h localhost -U explorer -l | grep explorer
   

2. Check database schema:

   psql -h localhost -U explorer -d explorer -c "\dt"
   

3. Verify tables exist:

   • blocks
   • transactions
   • addresses

Priority 3: Test All Endpoints

After starting the backend, run the diagnostic script again:

cd /home/intlc/projects/proxmox/explorer-monorepo
./scripts/check-logs-and-errors.sh

---

Expected Behavior After Fixes

Once the backend is running:

1. ✅ /api/v2/stats should return statistics
2. ✅ /api/v1/blocks should return block list
3. ✅ /api/v1/transactions should return transaction list
4. ✅ /api?module=block&action=eth_block_number should return latest block number
5. ✅ Frontend should load data from both local API and Blockscout
6. ✅ Health endpoint /health should return service status

---

Monitoring and Logging

Backend Logs

The backend uses Go's standard log package. Logs will show:

• Server startup: Starting SolaceScan REST API server on :8080
• Request logs: GET /api/v2/stats 200 2.5ms
• Errors: Database connection errors, query failures, etc.

Frontend Console

Check browser console (F12) for:

• Ethers library loading status
• API call errors
• Network request failures

Health Check Endpoint

Once backend is running, check health:

curl http://localhost:8080/health

Expected response:

{
  "status": "healthy",
  "timestamp": "2025-12-24T08:55:07Z",
  "services": {
    "database": "ok",
    "api": "ok"
  },
  "chain_id": 138,
  "explorer": {
    "name": "SolaceScan",
    "version": "1.0.0"
  }
}

---

Summary

✅ What's Working

• RPC connectivity (ChainID 138)
• Blockscout API (all endpoints)
• Frontend configuration
• HTTPS connectivity

❌ What's Broken

• Backend API server (not running)
• All local API endpoints
• Database connectivity check (can't verify without backend)

🔧 What Needs Fixing

1. Start backend server (Priority 1)
2. Verify database configuration (Priority 2)
3. Test all endpoints (Priority 3)

---

Next Steps: Start the backend server and re-run the diagnostic script to verify all issues are resolved.