# Quick Fix Guide - Explorer Errors

**Status**: 🔴 Backend API Server Not Running

---

## Problem

All API endpoints are returning HTTP 000 (connection refused) because the backend server is not running.

## Quick Fix (5 minutes)

### Step 1: Set Database Environment Variables

```bash
export DB_HOST=localhost
export DB_PORT=5432
export DB_USER=explorer
export DB_PASSWORD=your_password_here
export DB_NAME=explorer
export CHAIN_ID=138
export PORT=8080
```

### Step 2: Start the Backend Server

**Option A: Using the startup script (Recommended)**
```bash
cd /home/intlc/projects/proxmox/explorer-monorepo
./scripts/start-backend.sh
```

**Option B: Manual start**
```bash
cd /home/intlc/projects/proxmox/explorer-monorepo/backend/api/rest
go run main.go
```

### Step 3: Verify It's Working

In another terminal:
```bash
# Check health endpoint
curl http://localhost:8080/health

# Check stats endpoint
curl http://localhost:8080/api/v2/stats

# Check blocks endpoint
curl http://localhost:8080/api/v1/blocks?page=1&page_size=1
```

### Step 4: Re-run Diagnostics

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

---

## Expected Results

After starting the backend:

✅ `/health` returns: `{"status":"healthy",...}`  
✅ `/api/v2/stats` returns statistics  
✅ `/api/v1/blocks` returns block list  
✅ `/api/v1/transactions` returns transaction list  
✅ Frontend loads data correctly  

---

## Troubleshooting

### Database Connection Error

If you see: `Failed to connect to database`

1. Check if PostgreSQL is running:
   ```bash
   sudo systemctl status postgresql
   ```

2. Verify database exists:
   ```bash
   psql -h localhost -U explorer -l | grep explorer
   ```

3. Test connection:
   ```bash
   psql -h localhost -U explorer -d explorer -c "SELECT 1;"
   ```

### Port Already in Use

If port 8080 is already in use:

```bash
# Find process using port 8080
lsof -i :8080

# Kill it
kill $(lsof -t -i:8080)

# Or use a different port
export PORT=8081
```

### Go Module Errors

If you see Go module errors:

```bash
cd /home/intlc/projects/proxmox/explorer-monorepo/backend
go mod download
go mod tidy
```

---

## Running as a Service (Optional)

To run the backend as a systemd service:

1. Create service file: `/etc/systemd/system/explorer-api.service`
2. See `docs/ERROR_REPORT_AND_FIXES.md` for service configuration
3. Enable and start:
   ```bash
   sudo systemctl daemon-reload
   sudo systemctl enable explorer-api
   sudo systemctl start explorer-api
   ```

---

## Full Error Report

For complete error analysis, see: `docs/ERROR_REPORT_AND_FIXES.md`