Event ID - 25

Event Id25
SourceMicrosoft-Windows-Time-Service
DescriptionThe time provider NtpClient cannot determine whether the response received from %1 has a valid signature. The response will be ignored. The error was: %2
Event InformationAccording to Microsoft :
Cause :
This event is logged when the time provider NtpClient cannot determine whether the response received from has a valid signature.
Resolution :
Investigate causes for invalid responses from the time source
The error in Event Viewer should provide additional information. There may be an operating system or network configuration error, rogue server, or attempted computer security attack. Verify that the network adapter is installed, enabled, and functioning properly. Ensure that TCP/IP is installed and configured properly.
Verify :
To perform this procedure, you must have membership in Administrators or you must have been delegated the appropriate authority.
To verify that the Windows Time service is synchronizing correctly:
  1. Open a command prompt as an administrator. To open a command prompt as an administrator, click Start. In Start Search, type Command Prompt. At the top of the Start menu, right-click Command Prompt, and then click Run as administrator. If the User Account Control dialog box appears, confirm that the action it displays is what you want, and then click Continue.
  2. At the command prompt, type W32TM /resync, and then press ENTER.
  3. At the command prompt, type W32TM /query /status, and then press ENTER.
    This command displays the status of the Windows Time service synchornization. The Last Successful Sync Time line of the output displays the date and time that you ran the W32TM /resync command in the previous step.
To confirm that the Windows Time service synchronized successfully with its time source when you ran the W32TM /resync command, verify that Event ID 35 appears in Event Viewer.
Reference LinksEvent ID 25 from Source Microsoft-Windows-Time-Service

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