Technical Notes

DNS Troubleshooting for Website Not Resolving

When a website is not loading, DNS misconfiguration is one of the most common causes. The following steps help identify and resolve DNS related issues.

Steps:

  1. Verify domain nameservers are correctly pointing to the hosting provider.
  2. Check DNS records such as A record, CNAME, and MX records.
  3. Confirm DNS propagation across global servers.
  4. Validate DNS zone configuration in the hosting control panel.
  5. Use command line tools to inspect DNS responses.

Useful Commands

dig example.com
nslookup example.com

These commands help verify DNS resolution and identify propagation issues.

WordPress Website Down Troubleshooting

If a WordPress website fails to load or shows an error, the issue may be related to plugins, themes, or server configuration.

Troubleshooting Steps

  1. Check if the server or hosting service is running properly.
  2. Disable plugins by renaming the plugins folder in wp-content.
  3. Verify .htaccess file configuration.
  4. Check PHP version compatibility with WordPress.
  5. Enable WordPress debugging mode.

Enable Debug Mode

define('WP_DEBUG', true);

This helps identify errors occurring within WordPress.

Basic Linux Commands for Server Troubleshooting

Linux commands are essential for diagnosing server performance and service issues.

Common Commands

top
df -h
free -m
netstat -tulpn
systemctl status apache2

Purpose

  • top – Displays running processes and CPU usage
  • df -h – Shows disk space usage
  • free -m – Displays memory utilization
  • netstat -tulpn – Lists open ports and services
  • systemctl status apache2 – Checks Apache web server status

API Testing Using Postman

Postman is commonly used to test APIs and verify application responses.

Steps

  1. Create a new request in Postman.
  2. Select request type (GET, POST, PUT, DELETE).
  3. Add request headers if required.
  4. Send the request to the API endpoint.
  5. Verify the response body and status code.

Common HTTP Status Codes

  • 200 – Request successful
  • 404 – Resource not found
  • 500 – Internal server error

Website Performance Troubleshooting

Slow websites impact user experience and search rankings. Performance issues can often be identified through server analysis and optimization techniques.

Optimization Steps

  1. Monitor server resource usage.
  2. Enable caching mechanisms.
  3. Optimize images and static resources.
  4. Use Content Delivery Networks (CDN).
  5. Review database queries for inefficiencies.

These steps help improve overall website performance and stability.

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