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Veeam ONE creates or changes local accounts of the "Veeam_*" format at the Veeam ONE server machine

KB ID: 4042
Product: Veeam ONE
Published: 2020-11-06
Last Modified: 2020-11-10
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Challenge

Veeam ONE creates or changes local accounts of the "Veeam_*" format on the Veeam ONE server machine.

Cause

This behavior is a part of the Veeam ONE design. Veeam ONE creates these temporary Windows accounts for login and authentication operations between Veeam ONE components and VMware virtual servers with VMware local or Single Sign-On users, which are not present on the Veeam ONE machine or in the AD domain. These accounts also act as "Tenants".
kb4042
These temporary accounts are normally present on the Veeam ONE server during the user session plus 30 days. Another purpose, besides the authentication, is to cache the information about VMware topology objects available for the Tenant user, so that during this 30-days inactive period, the Tenant user may quickly log in again.

Solution

The use of these aliases cannot be disabled, however, the retention period (30 days of inactivity after last user session) can be changed in the registry. It is controlled by the value HKEY_LOCAL_MACHINE\SOFTWARE\Veeam\Veeam ONE Monitor\Service\InactiveLocalUserKeepIntervalSec (DWORD), which equals 2592000 seconds (30 days) by default.

Note that 0 value means that these users will not be deleted (no retention period), so for the immediate removal, the value must be set to 1 second.

To match the actual users and their temporary account aliases, Veeam ONE uses the "Veeam_<USER5><1A3B5C7D>" format , where "<USER5>" contains five first letters of the username used for authentication, and "<1A3B5C7D>" is a hash-code based on the username and password.

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