The error code 0x00000086 translates to a decimal value of 134 and is associated with the NTP_CLIENT_TIME_UPDATE_REFUSED bug check in Windows. This error indicates an issue with the Windows Time service (W32Time) specifically related to the Network Time Protocol (NTP) client.

Here’s a breakdown of the error and potential solutions:

Understanding NTP_CLIENT_TIME_UPDATE_REFUSED Error:

The NTP client within the Windows Time service is responsible for synchronizing your system clock with external time servers over the internet. The 0x00000086 error signifies that the NTP client attempted to update your system time from a time server but was rejected. This rejection can happen due to a few reasons:

• Incorrect Time Server Settings: The NTP client might be configured to use an invalid or unreachable time server address.
• Firewall Blocking NTP Traffic: Your firewall might be blocking communication between the NTP client and the time server, preventing time synchronization.
• Time Server Issues: In rare cases, the time server itself might be experiencing problems and unable to respond to requests.

Troubleshooting Steps for NTP_CLIENT_TIME_UPDATE_REFUSED:

1. Verify NTP Server Settings:

   • Open Command Prompt (Admin).

   • Type the following command and press Enter:

     <code data-test-id="code-content">w32tm /query /configuration /sync
     </code>

   • This command will display the configured time server addresses.

   • Check if the listed servers are valid public NTP servers (e.g., pool.ntp.org).

   • If the addresses are incorrect or unreachable, you can update them using the w32tm command (consult Microsoft documentation for specific syntax).

2. Check Firewall Rules:

   • Ensure your firewall allows outgoing traffic on ports UDP 123 (default NTP port). You might need to temporarily disable your firewall to test if it’s blocking NTP traffic. (Caution: Re-enable your firewall after testing).

3. Restart Windows Time Service:

   • Open Command Prompt (Admin).

   • Type the following commands and press Enter after each:

     <code data-test-id="code-content">net stop w32time
     net start w32time
     </code>

   • This will stop and then restart the Windows Time service, which might resolve temporary glitches.

4. Check for Time Server Issues (Limited Control):

   • You can try using online time checkers to verify if the configured time servers are operational. However, you might have limited control over fixing issues on the actual time server itself.

5. Consider Alternative Time Servers:

   • If the configured time servers are unreachable or problematic, you can try setting the NTP client to use alternative public time servers like [invalid URL removed].

Additional Tips:

• Keep your system time synchronized for accurate timestamps on files and system logs.
• Consider using a reliable internet connection to ensure smooth communication with time servers.

If none of these solutions work, it’s recommended to consult Microsoft documentation or seek help from a network administrator familiar with time synchronization issues. They can delve deeper into potential network configuration problems or identify alternative solutions specific to your situation.