Veeam – Unable to allocate processing resources. Error: Failed to take in-guest VSS snapshot COM Error: Code: 0x80042308

Download Hyper-V integration

Force reinstall of Hyper-V integration
1. download HyperV Integrations Compontens
2. run command:

3. Validate file version on this file c:\windows\system32\drivers\vmbus.sys it must be at least 6.3.9600.17415 – Note: this file doesn’t seem to be present in Server 2012 R2

Sources:
https://forums.veeam.com/microsoft-hyper-v-f25/9-5-hyper-v-known-issues-t38927-150.html

https://www.pc2s.fr/?p=1568

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