How should I interpret “TIME_ERROR: 0x41: Clock Unsynchronized” on an Optical Diode, and what should I do about it?

What the message means

kernel reports TIME_ERROR: 0x41: Clock Unsynchronized indicates the system time is reporting that the clock is not currently synchronized to a valid upstream time source (i.e., NTP has not locked yet or lost sync). The underlying TIME_ERROR status is commonly described as “clock not synchronized.”

Is it critical?

In most real deployments, this is not automatically a critical fault:

• It is frequently seen during NTP startup or early convergence (especially right after boot/service restart). In that situation it is typically warning/informational.
• It becomes an operational concern if it is persistent (repeating continuously over long periods), because time drift impacts log/audit accuracy and troubleshooting correlation (even if file transfer still works).

Practical guidance: if the message is rare/transient, it is unlikely to be the root cause of intermittent transfer failures by itself; still, it should be corrected as a best practice.

Why we still recommend fixing it

Even when it is not the direct cause of your transfer issue, time sync is important because:

• It improves cross-node correlation (BLUE vs RED events line up reliably).
• It reduces confusion during incident analysis and support escalation.

OPSWAT’s documentation explicitly supports configuring time and notes that manual time setting triggers a reboot on both BLUE and RED, which makes stable NTP configuration the preferred approach.

Recommended remediation

Preferred: Configure NTP (recommended)

1. Configure reachable NTP servers appropriate for each zone (BLUE and RED may need different NTP sources depending on segmentation).
2. Verify the node reaches a synchronized state (message stops recurring after convergence).

Fallback: Manual time (only when NTP is impossible)

• Use manual time only if NTP is not feasible.
• Plan a maintenance window: OPSWAT documents that setting time manually will reboot both BLUE and RED nodes.

How to confirm it’s “transient” vs “persistent”

• Transient: a few occurrences around boot or service restart, then quiet. This aligns with “normal during startup.”
• Persistent: repeated occurrences over extended time → investigate NTP reachability, NTP server IPs, firewall rules to NTP sources, and whether a time service is being stopped/restarted.