DNS_ERROR_RRL_INVALID_IPV6_PREFIX 0x800726BA

Error code 9914 · HRESULT 0x800726BA

WINDOWS

The IPv6 prefix length parameter is invalid. It should be less than or equal to 128.

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_RRL_INVALID_IPV6_PREFIX is a Windows error code (system error 9914, returned as HRESULT 0x800726BA) reported by Windows. Its official message is: “The IPv6 prefix length parameter is invalid. It should be less than or equal to 128.”

How to fix DNS_ERROR_RRL_INVALID_IPV6_PREFIX

  1. Test connectivity to the remote host first (ping, then the exact port)
  2. Check firewall, VPN and proxy rules for the involved process
  3. Run 'ipconfig /flushdns' and 'netsh interface ip reset', then reboot

Related errors

DNS_ERROR_RRL_INVALID_IPV4_PREFIXDNS_ERROR_RRL_INVALID_TC_RATEDNS_ERROR_RRL_INVALID_LEAK_RATEDNS_ERROR_RRL_INVALID_WINDOW_SIZEDNS_ERROR_RRL_NOT_ENABLEDDNS_ERROR_RRL_LEAK_RATE_LESSTHAN_TC_RATEDNS_ERROR_VIRTUALIZATION_INSTANCE_ALREADY_EXISTS

Source: Microsoft WinError.h

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