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Guest processing fails for Nutanix AHV, Proxmox VE, Scale Computing HyperCore

KB ID: 4842
Product: Veeam Backup & Replication | 13
Veeam Backup for Nutanix AHV | 9
Veeam Plug-In for Proxmox VE | 3
Published: 2026-03-31
Last Modified: 2026-03-31
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Challenge

When running backup or replication jobs for Windows virtual machines hosted on Nutanix AHV, Proxmox VE, or Scale Computing HyperCore with Veeam Backup & Replication 13.0.1 Patch 2, guest processing fails with one of the following errors:

Failed to install guest processing components for [VM name]. Error: Failed to connect to the guest OS.

or

Failed to prepare guest for hot backup. Error: Cannot start service. Machine: [IP address]. Service: [VeeamGuestHelper]. Cannot start service. Win32 error: The service did not respond to the start or control request in a timely fashion. Code: 1053
Backup job summary showing failed status for both "ubu" and "SQL" entities, with errors indicating failure to prepare the guest for hot backup and failure to install guest processing components due to being unable to start the VeeamGuestHelper service.

Cause

This issue occurs due to an in-guest processing component that may be assigned an invalid port value, preventing it from initializing.

Solution

Install the private fix provided below.

Note: This fix applies only to Veeam Backup & Replication build 13.0.1.2067. Verify your build number under Help > About before proceeding.

  1. Ensure no backup, replication, or restore sessions are currently running.
  2. Close Veeam Backup & Replication Console on all machines where it is open.
  3. On the Veeam Backup & Replication server, execute the private fix file as an Administrator.
  4. Follow the on-screen prompts to complete the installation.
  5. Reopen the console and confirm that guest processing completes successfully for the affected VMs.
Download Private Fix

Filename: KB4842_20260331_VBR_13.0.1.2067_PF1309581.zip

MD5: 6CD1901BA27D3AEA60A2D7CA979912DA
SHA1: 1393D67F506D6ABADE2314263A4288109B04205F
SHA256: 6EE196110E96EF50E6F4B7C53A31AC87826272589DADE166F501C9C33A1DB241

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