Fix DNS Resolution Failure — Diagnose & Restore Connectivity

Direct answer

DNS resolution failures occur when a domain's DNS records are misconfigured, the domain registration has expired, or DNS propagation is incomplete. Use dig or nslookup to verify current resolution, then check the DNS provider for correct record configuration.

Structured breakdown

Cause

DNS resolution failures are caused by misconfigured DNS records, expired domains, or DNS server issues. Use dig or nslookup to check record propagation, then verify your DNS configuration.

Fix

  • Run dig <domain> or nslookup <domain> to check current DNS resolution
  • Verify DNS records in your DNS provider dashboard (A, CNAME, etc.)
  • Check domain registration status renew if expired

Outcome

Domain resolves correctly from all locations and services reconnect without DNS errors.

Common causes

  • DNS records misconfigured or deleted
  • Domain registration expired
  • DNS propagation not yet complete after a change
  • DNS server (e.g., Route 53, Cloudflare) experiencing issues
  • Local DNS cache serving stale records

Fix steps

  1. 1

    Run dig <domain> or nslookup <domain> to check current DNS resolution

  2. 2

    Verify DNS records in your DNS provider dashboard (A, CNAME, etc.)

  3. 3

    Check domain registration status renew if expired

  4. 4

    Flush local DNS cache: ipconfig /flushdns (Windows) or sudo dscacheutil -flushcache (macOS)

  5. 5

    Wait for DNS propagation if changes were made recently (up to 48 hours for some records)

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Frequently asked questions

Related technical context

These examples show the commands, logs, and configuration patterns most often used to verify this issue.

Command examples

  • dig example.com +short
  • nslookup example.com 8.8.8.8
  • dig example.com @ns1.cloudflare.com

Log snippet

NXDOMAIN - Query for example.com returned no results
server can't find example.com: NXDOMAIN
resolution failed: SERVFAIL

Config snippet

; DNS Zone File
example.com.  IN  A      203.0.113.10
www           IN  CNAME  example.com.
@             IN  MX 10  mail.example.com.