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The timeout error displayed in Veeam Backup & Replication can be caused by various factors. This article specifically addresses a scenario where the Windows OS experiences a 'heap allocation' failure.
Please note that the solution provided in this article is only applicable if you have identified Event ID #243 in the Windows System Event Logs (eventvwr.msc). If this event is not present, this article may not provide a relevant solution.
Error Job <JobName> cannot be started. SessionId: <UUID>, Timeout: [361 sec]
Managed session <UUID> has failed
Error Job <JobName> cannot be started. SessionId: <UUID>, Timeout: [361 sec]
Error Job [Infrastructure update] has failed to start. Timeout expired (6 minutes). SessionId: <UUID>
Log Name: System
Source: Win32k
Event ID: 243
Task Category: None
Level: Warning
Keywords: Classic
User: N/A
Computer:
Description:
A desktop heap allocation failed.
NT AUTHORITY\SYSTEM
context. If the Windows OS is running out of Desktop Heap memory, new processes can't be started.
The Desktop Heap size must be increased via a registry modification.
Because this change will affect the desktop heap of all services (also known as non-interactive window stations), do not make the new value larger than necessary.
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