DNS_ERROR_CLIENT_SUBNET_IS_ACCESSED 0x800726F7

Error code 9975 · HRESULT 0x800726F7

WINDOWS

The client subnet cannot be deleted while it is being accessed by a policy.

Windows troubleshooting diagram: Device Manager warning and a system file scan
Windows errors: check drivers, system files and Event Viewer, in that order.

What it means

DNS_ERROR_CLIENT_SUBNET_IS_ACCESSED is a Windows error code (system error 9975, returned as HRESULT 0x800726F7) reported by Windows. Its official message is: “The client subnet cannot be deleted while it is being accessed by a policy.”

How to fix DNS_ERROR_CLIENT_SUBNET_IS_ACCESSED

  1. Run the affected program as administrator (right-click → Run as administrator)
  2. Check permissions on the target resource: Properties → Security → your account
  3. Check Event Viewer → Windows Logs → Security for the matching audit entry
  4. Test connectivity to the remote host first (ping, then the exact port)
  5. Check firewall, VPN and proxy rules for the involved process
  6. Run 'ipconfig /flushdns' and 'netsh interface ip reset', then reboot

Related errors

DNS_ERROR_CLIENT_SUBNET_DOES_NOT_EXISTDNS_ERROR_CLIENT_SUBNET_ALREADY_EXISTSDNS_ERROR_POLICY_INVALID_SETTINGSDNS_ERROR_POLICY_INVALID_CRITERIADNS_ERROR_POLICY_DOES_NOT_EXISTDNS_ERROR_SUBNET_DOES_NOT_EXISTDNS_ERROR_POLICY_ALREADY_EXISTS

Source: Microsoft WinError.h

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