Error Database · Windows

0xC004C4AE

Quick overview: 0xC004C4AE

Windows could not resolve the domain name of Microsoft's activation servers. This is a DNS or network connectivity problem — your PC cannot translate activation hostnames into IP addresses.

This page documents DNS Lookup Failed During Online Activation on Windows. Activation codes are licensing checkpoints—they rarely indicate hardware failure. Use the steps below before assuming your product key is permanently invalid.

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DNS Lookup Failed During Online Activation

Error code: 0xC004C4AE Platform: Windows Updated: 2026-07-17

What This Error Means

Windows could not resolve the domain name of Microsoft's activation servers. This is a DNS or network connectivity problem — your PC cannot translate activation hostnames into IP addresses.

Router DNS issues, Pi-hole blocklists, corporate filtering, and ISP outages are common triggers. The product key itself is usually fine.

How to Fix It

  1. Flush DNS: ipconfig /flushdns in admin Command Prompt.
  2. Switch to public DNS: 1.1.1.1 or 8.8.8.8 in network adapter settings.
  3. Disable ad-blockers, Pi-hole, or NextDNS filters temporarily.
  4. Test connectivity: nslookup activation.sls.microsoft.com.
  5. Retry activation or use phone activation (slui.exe 4) as a workaround.