DNS_ERROR_CNAME_COLLISION 0x800725ED

Error code 9709 · HRESULT 0x800725ED

WINDOWS

A CNAME record already exists for given name.

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_CNAME_COLLISION is a Windows error code (system error 9709, returned as HRESULT 0x800725ED) reported by Windows. Its official message is: “A CNAME record already exists for given name.”

How to fix DNS_ERROR_CNAME_COLLISION

  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_CNAME_LOOPDNS_ERROR_NODE_IS_CNAMEDNS_ERROR_RECORD_ONLY_AT_ZONE_ROOTDNS_ERROR_RECORD_ALREADY_EXISTSDNS_ERROR_NAME_NOT_IN_ZONEDNS_ERROR_SECONDARY_DATADNS_ERROR_RECORD_TIMED_OUT

Source: Microsoft WinError.h

Last updated: