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0X000025FA

An alias loop has been detected with either CNAME or DNAME records

Home / Error Codes / Windows system operation / 0X000025FA

Microsoft defines 0X000025FA as DNS_ERROR_ALIAS_LOOP: An alias loop has been detected with either CNAME or DNAME records.

SeverityMediumSystemsWindows 10 / 11SymbolDNS_ERROR_ALIAS_LOOPUpdatedSep 1, 2026

Overview

0X000025FA is the Win32 representation of DNS_ERROR_ALIAS_LOOP. The code identifies the documented condition, while the calling program, timestamp, logs, and repeatable operation identify the responsible component.

Common causes

  • The affected operation returned the official DNS_ERROR_ALIAS_LOOP condition
  • The calling program encountered the documented result: An alias loop has been detected with either CNAME or DNAME records.
  • A configuration, resource, or dependency used by the windows system operation operation did not meet its requirements
  • A recent program, service, installer, or system change altered the context in which 0X000025FA occurs

Symptoms

  • Confirm which operation returned 0x000025FA
  • Match 0x000025FA to events from the same timestamp
  • Retest once and preserve any changed result

Prevention

  • Preserve Application and System events that accompany 0X000025FA
  • Use supported installers and configuration methods for the affected windows system operation workflow
  • Document changes so the operating context for DNS_ERROR_ALIAS_LOOP can be reconstructed

0X000025FA diagnostic evidence

Official-definition grounded

Use the code identity and the affected operation together. The same numeric result can appear in different workflows, so logs and symptoms determine the safest repair branch.

Hexadecimal0X000025FA
Unsigned decimal9722
SymbolDNS_ERROR_ALIAS_LOOP
Error familyWindows system operation
Severity bitSuccess / informational
Evidence sourceMicrosoft System Error Codes (WinError.h)
1Confirm the operationConfirm which operation returned 0x000025FA
2Collect matching evidenceMatch 0x000025FA to events from the same timestamp
3Retest the same actionRetest once and preserve any changed result

Definition source: Microsoft System Error Codes (WinError.h). This report preserves the official code identity and does not claim one universal cause.

How to troubleshoot error 0X000025FA

Use these Windows-native steps in order. Stop when Windows Update works again; advanced repair commands are not necessary on every PC.

1

Restart Windows and retry the update

Save your work, restart the PC, then open Settings > Windows Update and select Check for updates. A restart can release pending files without changing Windows configuration.

2

Run the Windows Update troubleshooter

Open Settings > System > Troubleshoot > Other troubleshooters. Locate Windows Update and select Run. Current Windows 11 versions may continue the diagnostic flow in Get Help.

3

Repair Windows components when indicated

If troubleshooting still reports missing or damaged components, open Terminal as administrator, run DISM RestoreHealth, and then run System File Checker. Do not interrupt either scan.

Before advanced repair: Back up important files. Managed work or school PCs may use organization update policies, so contact the administrator before changing services or update components.

Official-source grounding

The error meaning is grounded in Microsoft System Error Codes (WinError.h). The visual sequence also follows Microsoft Support guidance for Windows Update troubleshooting and Microsoft DISM repair guidance. Causes and repair steps vary by system evidence; this report does not claim a universal success rate.

Frequently asked questions

What does 0X000025FA mean?

Microsoft defines 0X000025FA as DNS_ERROR_ALIAS_LOOP: An alias loop has been detected with either CNAME or DNAME records. 0X000025FA is the Win32 representation of DNS_ERROR_ALIAS_LOOP. The code identifies the documented condition, while the calling program, timestamp, logs, and repeatable operation identify the responsible component.

Is 0X000025FA always caused by the same problem?

No. The code identifies a failure condition, but the exact cause depends on the affected operation, Windows build, logs, and recent system changes.

Can Advanced System Repair help with 0X000025FA?

Advanced System Repair can scan for damaged Windows components and related system issues. No tool can guarantee one universal fix; preserve backups and match repair steps to the evidence on the affected PC.