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Event ID 149: The time sample was rejected because: The peer is not synchronized, or reachability has been lost in one, or both, directions

Windows Event ID Lookup: What Windows event IDs mean: 4625, 4624, 4740, 6008, 41, 7045, 1102 and 3,000 more, with Windows' own message text, the fields and what to check.

Look up a Windows event ID from Event Viewer, a SIEM alert or a log export: what it means, the fields it records, and what to check. Many IDs are used by more than one source (event 41 is both a Kernel-Power crash and a boot error), so every definition is shown, the one people usually mean first. The message text is Windows' own, read from the event providers of Windows 10.0.26200.0, 2026-10-28; the notes are ours, based on Microsoft's security auditing reference.

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The time sample was rejected because: The peer is not synchronized, or reachability has been lost in one, or both, directions.

Event 149
Time-Service
System log
Information
Message and fields (as Event Viewer shows them) 
The time sample was rejected because: The peer is not synchronized, or reachability has been lost in one, or both, directions. This may also indicate that the peer has incorrectly sent an NTP request instead of an NTP response.

In the past … seconds we had high latency IOs and/or IO failures.

Event 149
Ntfs
System log
Warning
Message and fields (as Event Viewer shows them) 
In the past … seconds we had high latency IOs and/or IO failures.

           High latency IO count: …
           Failed writes: …
           Failed reads: …
           Bad clusters relocated: …

           Volume Id: …
           Volume name: …
           Is boot volume: …

           Device GUID: …
           Device manufacturer: …
           Device model: …
           Device revision: …
           Device serial number: …
           Bus type: …
           Native NVMe: …

           Adapter serial number: …

Task "…" is using a combination of properties that is incompatible with the scheduling engine.

Event 149
TaskScheduler
TaskScheduler/Operational log
Warning
Message and fields (as Event Viewer shows them) 
Task "…" is using a combination of properties that is incompatible with the scheduling engine.