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Fixing Event ID 8018: DNS Host Record Registration Failure on Windows

| IT Fixes

Who This Affects and What It Fixes

This guide is for employees whose Windows domain computer is logging Event ID 8018 in the System event log. That event means the computer tried to register its host (A or AAAA) record in DNS automatically but failed. Until the record registers correctly, the computer may not be reachable by name, Group Policy and domain authentication may break, and remote access or file shares may stop working. The steps below resolve the DNS registration failure and restore normal Active Directory and network operations.

What You Will Need

Before you begin, make sure you have access to the following tools on the affected computer or your domain’s DNS server:

  • Event Viewer
  • DNS Manager (on the DNS server)
  • Network Adapter Settings
  • Command Prompt or PowerShell (run as Administrator)
  • Active Directory Users and Computers (if applicable)

Step-by-Step Fix

  1. Confirm the error in Event Viewer.
    • Open Event Viewer.
    • Navigate to Windows Logs > System.
    • Locate Event ID 8018.
    • Note the DNS server and zone referenced in the error message — you will need these details in later steps.
  2. Verify the computer is pointing to the correct DNS server.
    • Open Command Prompt.
    • Run: ipconfig /all
    • Check the DNS Server listed in the output. It should be your internal domain DNS server, not a public address.
    • If it is incorrect, open Network Adapter Settings and update the DNS server address to your internal domain DNS server.
  3. Verify the DNS zone allows dynamic updates.
    • Open DNS Manager on the DNS server.
    • Expand Forward Lookup Zones.
    • Right-click the domain zone and select Properties.
    • Confirm that Dynamic updates is set to Secure only or Nonsecure and secure. If it is set to None, dynamic registration is disabled and must be enabled.
  4. Check for a stale A record and remove it if necessary.
    • In DNS Manager, open the affected zone.
    • Locate the hostname record for the affected computer.
    • If the record contains an old or incorrect IP address, delete it. This allows the computer to re-register with the correct address.
  5. Manually force DNS registration.
    • On the affected computer, open Command Prompt as Administrator.
    • Run: ipconfig /registerdns
    • Wait 30–60 seconds for registration to complete.
  6. Restart the DNS Client service.
    • In the same Administrator Command Prompt, run: net stop dnscache
    • Then run: net start dnscache
  7. Verify permissions on the DNS record.
    • In DNS Manager, enable Advanced View.
    • Right-click the record or zone and select Properties > Security.
    • Confirm the computer account has permission to update the record. If it does not, add or correct the permission.
  8. Restart the affected computer.
    • A restart ensures DNS registration runs automatically during startup, confirming the fix is persistent.

Expected Results

After completing these steps you should see the following:

  • The computer successfully registers its A record in DNS.
  • Event ID 8018 no longer appears in the System log.
  • The computer resolves correctly by hostname.
  • Active Directory and network services such as Group Policy, domain authentication, and file shares function normally.

Still Seeing Event ID 8018?

If the event continues to appear after completing all steps, the issue may involve deeper DNS infrastructure or Active Directory permissions that require hands-on review. Contact the ACS support team for assistance.

Common questions

What causes Event ID 8018 on Windows?

Event ID 8018 occurs when a Windows computer attempts to dynamically register its host (A or AAAA) DNS record but fails. Common causes include incorrect DNS server settings on the network adapter, the DNS zone not allowing dynamic updates, a stale or locked existing record, or the computer account lacking permission to update the record.

Will this error affect my ability to log in to the domain or use network resources?

It can. When Event ID 8018 is present, the computer may not be reachable by hostname, which can disrupt Group Policy processing, domain authentication, remote access, and shared network resources that rely on DNS name resolution.

Do I need to be on the DNS server to fix this, or can I fix it from my own computer?

Some steps — such as running ipconfig /registerdns and restarting the DNS Client service — are performed on the affected computer and only require local Administrator access. Other steps, such as checking zone dynamic update settings and verifying record permissions, require access to DNS Manager on your domain’s DNS server and are typically handled by an IT administrator.