Clock drifting can lead to significant problems, especially, but not limited to in domain-joined computers, primarily because Active Directory environments rely on the Kerberos authentication protocol, which is sensitive to time discrepancies.
The most immediate problem caused by clock drifting is the failure of the Kerberos authentication process. Kerberos requires the clocks of the client, the server, and the domain controller to be closely synchronized, usually within a five-minute tolerance. If a computer's clock drifts beyond this range, it can no longer authenticate with the domain, leading to users being unable to log in or access network resources.
Clock drifting can be the cause for the trust relationship being broken between the workstation and the primary domain:
In addition, once a computer's time is out of sync, access to network shares, databases, and other resources that rely on domain authentication can be disrupted. Users may experience errors or be denied access altogether, affecting productivity and operations.
Accurate timekeeping is also crucial for logging and monitoring activities within a network. Clock drifting can lead to inaccurate timestamps on logs, making it difficult to track events or identify security breaches, thus compromising the company’s security.
Clock drifting can also be an indication of looming hardware failure.
Check the CMOS Battery
The CMOS (Complementary Metal-Oxide-Semiconductor) battery powers the BIOS firmware in your computer. This tiny battery helps maintain system time and settings when the computer is turned off. Over time, the CMOS battery can weaken or fail, leading to timekeeping issues, including clock drift.
Symptoms of a failing CMOS battery include the computer's clock resetting to a default date/time upon startup, BIOS settings resetting to defaults, and noticeable time drift when the computer is powered off for extended periods.
To address this, physically inspect the CMOS battery on the motherboard. If you suspect it's failing, replace the battery. CMOS batteries are usually inexpensive and can be easily replaced on most desktops and some laptops. Refer to the device's manual for guidance on replacement procedures.
Update Firmware/BIOS
Sometimes, timekeeping inaccuracies can be related to bugs or limitations in the computer's firmware or BIOS. Manufacturers release updates that improve stability and functionality, including timekeeping accuracy.
Check the manufacturer's software (such as Lenovo System Update, Dell Command Update, or HP Support Assistant) or website for any available firmware or BIOS updates for your hardware. Applying these updates can resolve underlying issues that contribute to clock drift. Be sure to follow the manufacturer's instructions carefully when updating firmware or BIOS to avoid potential system damage.
Hardware Diagnostics
Run hardware diagnostics to check for faults with the motherboard or other system components that might affect timekeeping. Some systems come with built-in diagnostic tools, or you can use third-party software.
Pay particular attention to tests that evaluate the motherboard and chipset functionality, as these components are directly involved in timekeeping when the operating system is not running.
Consider System Age and Environment
Older hardware may be more prone to timekeeping issues due to wear and tear or outdated technology. In such cases, consider if upgrading to newer hardware might be more cost-effective in the long run.
Environmental factors such as extreme temperatures can also affect hardware performance and accuracy. Ensure that your hardware is operating within recommended temperature ranges and that cooling systems are functioning properly.
Set a reliable time source centrally
Choose a reliable time source for your network. This can be an internal server that acts as a primary time server (often a domain controller in an Active Directory environment) or an external time server (like those available from pool.ntp.org).
Active Directory
If you're using an internal server, configure it to synchronize with an external, authoritative time source. This ensures your network time is aligned with a global standard.
On Windows servers, you can use the w32tm command to configure time service settings. Do this by opening Command Prompt as an Administrator.
For example, to set an external NTP server, use:
- w32tm /config /manualpeerlist:"pool.ntp.org" /syncfromflags:manual /reliable:YES /update
Restart the time service after making changes:
- net stop w32time && net start w32time
Ensure all domain-joined clients and secondary servers are configured to synchronize their time with the primary time server. In an Active Directory domain, this is often handled automatically, but you can manually check or set this with the w32tm command.
For example, to configure a client or secondary server to sync with a domain controller, use:
- w32tm /config /syncfromflags:domhier /update
followed by restarting the time service:
- net stop w32time && net start w32time
Modern endpoint management
All modern endpoint management solutions offer ways to configure the time server through configuration profiles and administrative templates. Refer to the developer’s documentation to set the time zone with your management solution.
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