# 🔧 Fix 500 Internal Server Error ## Run These Commands in Your Terminal ### Step 1: Check Nginx Error Logs ```bash sudo tail -50 /var/log/nginx/error.log ``` This will show you the EXACT error. Look for lines mentioning: - Permission denied - No such file or directory - Connection refused --- ### Step 2: Check File Permissions ```bash ls -la /home/plagis/workspace/plagis_aumentum/web_frontend/ ``` The files should be readable by nginx (www-data user). **If you see permission issues, fix with:** ```bash sudo chmod -R 755 /home/plagis/workspace/plagis_aumentum/web_frontend/ sudo chown -R $USER:$USER /home/plagis/workspace/plagis_aumentum/web_frontend/ ``` --- ### Step 3: Verify API is Running ```bash ps aux | grep aumentum_api ``` **If you DON'T see `python3 aumentum_api.py`, start it:** ```bash cd /home/plagis/workspace/plagis_aumentum source venv/bin/activate nohup python3 aumentum_api.py > api.log 2>&1 & ``` **Then verify it's accessible:** ```bash curl http://127.0.0.1:8001/ ``` Should return: `{"service":"Aumentum Browser API"...}` --- ### Step 4: Test Nginx Configuration ```bash sudo nginx -t ``` Should show: `syntax is ok` and `test is successful` --- ### Step 5: Check Nginx is Serving Files ```bash curl http://127.0.0.1:7000/ ``` **Expected:** HTML content (...) **If error:** Check error log from Step 1 --- ### Step 6: Test API Proxy ```bash curl http://127.0.0.1:7000/api/ ``` **Expected:** `{"service":"Aumentum Browser API"...}` **If error:** API might not be running or proxy config wrong --- ## 🎯 Common Issues & Fixes ### Issue 1: Permission Denied ``` Error log shows: "Permission denied" ``` **Fix:** ```bash sudo chmod -R 755 /home/plagis/workspace/plagis_aumentum/web_frontend/ ``` --- ### Issue 2: File Not Found ``` Error log shows: "No such file or directory" ``` **Fix:** Check nginx config has correct path ```bash cat /etc/nginx/sites-available/aumentum | grep root ``` Should show: ``` root /home/plagis/workspace/plagis_aumentum/web_frontend; ``` **If wrong path, edit:** ```bash sudo nano /etc/nginx/sites-available/aumentum # Fix the root path sudo systemctl restart nginx ``` --- ### Issue 3: API Not Running ``` curl http://127.0.0.1:8001/ fails ``` **Fix:** ```bash cd /home/plagis/workspace/plagis_aumentum source venv/bin/activate python3 aumentum_api.py ``` Keep this terminal open, or run in background: ```bash nohup python3 aumentum_api.py > api.log 2>&1 & ``` --- ### Issue 4: SELinux or AppArmor Blocking ``` Error log shows: "Permission denied" even with correct permissions ``` **Fix:** ```bash # Check if SELinux is enforcing getenforce # If "Enforcing", temporarily set to permissive: sudo setenforce 0 # Or for AppArmor: sudo aa-complain /usr/sbin/nginx ``` --- ## 📊 Complete Diagnostic Commands Run all of these and share the output: ```bash echo "=== 1. Nginx Error Log ===" sudo tail -20 /var/log/nginx/error.log echo "" echo "=== 2. Nginx Config ===" cat /etc/nginx/sites-available/aumentum echo "" echo "=== 3. File Permissions ===" ls -la /home/plagis/workspace/plagis_aumentum/web_frontend/ | head -10 echo "" echo "=== 4. API Status ===" ps aux | grep aumentum_api | grep -v grep curl -s http://127.0.0.1:8001/ | head -3 echo "" echo "=== 5. Nginx Status ===" sudo systemctl status nginx --no-pager | head -15 echo "" echo "=== 6. Port Listening ===" sudo netstat -tlnp | grep 7000 echo "" echo "=== 7. Firewall Status ===" sudo ufw status | grep 7000 echo "" echo "=== 8. Test Direct Access ===" curl -I http://127.0.0.1:7000/ echo "" echo "=== 9. Test API Proxy ===" curl -I http://127.0.0.1:7000/api/ ``` --- ## 🎯 Most Likely Issues Based on 500 error, it's usually one of these: ### 1. **API Not Running** (Most Common) ```bash cd /home/plagis/workspace/plagis_aumentum source venv/bin/activate nohup python3 aumentum_api.py > api.log 2>&1 & ``` ### 2. **File Permissions** ```bash sudo chmod -R 755 /home/plagis/workspace/plagis_aumentum/web_frontend/ ``` ### 3. **Incorrect Root Path in Nginx** Check nginx config has: ``` root /home/plagis/workspace/plagis_aumentum/web_frontend; ``` --- ## ✅ Quick Fix Script Run this to fix most common issues: ```bash #!/bin/bash # Fix permissions sudo chmod -R 755 /home/plagis/workspace/plagis_aumentum/web_frontend/ # Start API if not running cd /home/plagis/workspace/plagis_aumentum source venv/bin/activate pkill -f aumentum_api # Stop old instances nohup python3 aumentum_api.py > api.log 2>&1 & # Restart nginx sudo systemctl restart nginx # Allow firewall sudo ufw allow 7000/tcp # Wait for services sleep 3 # Test echo "Testing..." curl -I http://127.0.0.1:7000/ ``` --- **Run the diagnostic commands above and share what you see in the error log!**