DNS Troubleshooting: How to Fix DNS Issues Fast (2026 Guide)

This article provides a 5-step guide to troubleshooting DNS issues, which are a common cause of network connectivity problems. It emphasizes starting with basic connectivity checks (pinging), flushing the DNS cache, verifying DNS server configurations, directly testing DNS resolution (using tools like `nslookup` or `dig`), and finally, checking for firewall or network blocks. The guide also covers identifying the root cause – from misconfigurations and caching issues to ISP outages – and offers solutions like switching to public DNS servers (Cloudflare, Google) when necessary.