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Multiple 'Event 81' messages are logged in Windows Event logs on Windows Server 2019 while running backups

Article: 100046942
Last Published: 2025-04-21
Ratings: 2 1
Product(s): Backup Exec
Problem

Multiple 'Event 81' messages are logged in Windows Event logs on Windows Server 2019 while running backups.

Error Message

Log Name:      System
Source:        Microsoft-Windows-FailoverClustering-Client
Date:          1/22/2020 8:04:46 PM
Event ID:      81
Task Category: None
Level:         Error
Keywords:      (1024)
User:          SYSTEM
Computer:      Server
Description:
LogExtendedErrorInformation (978):
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
  <System>
    <Provider Name="Microsoft-Windows-FailoverClustering-Client" Guid="{a82fda5d-745f-409c-b0fe-18ae0678a0e0}" />
    <EventID>81</EventID>

Cause

Backup Exec is a cluster aware application, so it uses Windows Cluster APIs extensively to check if a server is part of a cluster. On Windows Server 2019 and above, the Cluster API generates Event-81 if the server is not a part of a cluster.

Solution


Backup Exec 21.1 now includes changes to help mitigate the errors generated by the Cluster API.

NOTE: Event ID 81 errors may still occur if there are any other issues related to the cluster.

 

Internal Notes

 

References

Etrack : 3983172

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