Time Sync

🛠 Ways to Fix the Clock Sync Issue

1. Restart Windows Time Service

• Press Win + R → type services.msc → press Enter

• Find Windows Time service

• Right‑click → Restart

• Try syncing again

2. Force Sync via Command Prompt

• Open Start → cmd → Run as Administrator

Run this command:
Code
w32tm /resync

If you see an error, run:
Code
net stop w32time

net start w32time

w32tm /resync

3. Change the Time Server

Sometimes the default server (time.windows.com) doesn’t respond.

• Go to Settings → Time & Language → Date & Time → Additional settings → Internet Time

• Click Change settings

• Replace the server with one of these:

  • pool.ntp.org

  • time.nist.gov

• Apply and sync
  ✅ Steps to Fix “No time data available”

1. Set a New Time Server

Open Command Prompt (Admin) and run:

Code

• w32tm /config /manualpeerlist:"pool.ntp.org" /syncfromflags:manual /update

You can replace pool.ntp.org with:

• time.nist.gov

• time.google.com

4. Check Firewall/Network

• Firewalls or proxies can block time sync

• Test if you can ping time.windows.com or pool.ntp.org

• If blocked, allow NTP traffic or switch to another server

5. Verify BIOS Clock

If sync keeps failing, your BIOS clock may be wrong.

• Restart PC → enter BIOS → check system time

• Correct it, then try syncing in Windows again

👉 The quickest fix is usually changing the server to pool.ntp.org or time.nist.gov

To allow NTP (Network Time Protocol) through the Windows 11 firewall

Method 1: Using Command Prompt (Admin)

• Open CMD as Admin: Search for cmd, right-click, and select "Run as administrator".

• Add Inbound Rule: Type netsh advfirewall firewall add rule name="NTP Inbound" dir=in protocol=udp localport=123 profile=any enable=yes action=allow and press Enter.

• Add Outbound Rule: Type netsh advfirewall firewall add rule name="NTP Outbound" dir=out protocol=udp localport=123 profile=any enable=yes action=allow and press Enter. 

Method 2: Using Windows Defender Firewall with Advanced Security (Recommended)

Open Firewall Settings: Press Win + R, type wf.msc, and press Enter to open Windows Defender Firewall with Advanced Security.

Create New Rule: 

• Click on Inbound Rules in the left pane, then New Rule on the right.

• Select Port, click Next.

• Choose UDP, enter 123 for the specific local port, click Next.

• Select Allow the connection, click Next.

• Check Domain, Private, Public, click Next.

• Name it (e.g., "NTP Inbound") and click Finish.

Repeat for Outbound: Right-click Outbound Rules and repeat the steps above to create an "NTP Outbound" rule.