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Introduction

When your website shows a 500, 502, or 503 error, it can be frustrating for both you and your visitors. These errors indicate server-side problems that may require troubleshooting at different levels.

Understanding Each Error Code

• 500 Internal Server Error: A general server issue, often caused by misconfigurations, corrupt files, or script errors.
• 502 Bad Gateway: Occurs when the server acts as a gateway and receives an invalid response.
• 503 Service Unavailable: Happens when the server is overloaded or undergoing maintenance.

Step 1: Check Your Server Status

Ensure that your web hosting provider is operational. You can:

• Check your hosting provider’s status page.
• Use downforeveryoneorjustme.com to see if the issue is global.
• Use SSH or cPanel to check server uptime.

Step 2: Check Error Logs

Finding the root cause requires checking server logs:

• cPanel: Go to cPanel > Metrics > Errors to view error logs.
• SSH: Run: tail -f /var/log/apache2/error.log (Apache) or tail -f /var/log/nginx/error.log (Nginx).

Step 3: Fix File and Permission Issues

Corrupt .htaccess files or incorrect permissions may cause 500 errors. To fix:

• Rename .htaccess: mv .htaccess .htaccess_backup
• Set correct file permissions: find /yourwebsite -type f -exec chmod 644 {} \;

Step 4: Restart Server Services

If you have VPS or Dedicated Hosting, restart services:

• Apache restart: systemctl restart apache2
• Nginx restart: systemctl restart nginx

For cPanel:

• Go to cPanel > Restart Services and restart Apache.

Step 5: Fix High Server Load (For 503 Errors)

A 503 error often means your server is overloaded. Try:

• Reduce high PHP usage by disabling unnecessary plugins.
• Upgrade to a larger hosting plan if traffic spikes are common.

Step 6: Check CDN and Firewall Settings

CDN or firewall misconfigurations can cause 502 errors:

• Disable Cloudflare temporarily and check.
• Adjust firewall rules to allow legitimate traffic.

Conclusion

By following these steps, you can identify and resolve common server errors efficiently. If issues persist, consider contacting WebCareSG for further assistance.

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