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Failed to verify Windows VeeamDeployment DLL on Windows

  • September 26, 2025
  • 3 comments
  • 209 views
R

Hi Community,

Recently i install Veeam Agent on Windows Server 2008 R2 via VBR 12 Inventory and got an error  

Failed to Verify C:\Windows\Veeam\Backup\Upload\VeeamDeploymentDll.dll Signature

 

I found this page https://www.veeam.com/kb4677 and explain 2 possible causes

  1. Antivirus Block → 
  1. Root and Intermediate CA is missing

To confim the issue we look at C:\ProgramData\Veeam\Backup\Svc.VeeamInstaller.log and got

Failed to verify file using the Authenticode provider. Verification status: A certificate chain could not be built to a trusted root authority. (-2146762486), last error: A certificate chain could not be built to a trusted root authority.

 

All are pointing to Certificate Issue, so i install all CA listed on Veeam here https://helpcenter.veeam.com/docs/backup/vsphere/trusted_root_certificates.html?ver=120.

After installing all CA still got same issue here. Are i missing something here? 

Any insight would be appreciated!

 

3 comments

D
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  • ddomask
  • Comes here often
  • 192 comments
  • September 29, 2025

Hey hey, 

 

With Win2008, might just be that the version of Veeam you’re using required a certificate that’s no longer required in newer versions

 

C:\program Files\Veeam\Backup and Replication\Backup\Packages

Look for the VeeamInstallerSvc.msi there (on the Backup Server itself) and follow the SigCheck instructions from this KB: https://www.veeam.com/kb2566

See which is not on the machine.

0x0D 0x0A
Mohamed Ali
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  • Mohamed Ali
  • VUG Leader
  • 85 comments
  • September 30, 2025

​@rifkifn  Windows 2008 R2 only supported SHA-1 originally. Veeam binaries are signed with SHA-256

Make sure that update KB3033929 and KB4474419 is installed in the OS to verify the Veeam binaries that are signed with SHA-2

https://support.microsoft.com/en-us/topic/microsoft-security-advisory-availability-of-sha-2-code-signing-support-for-windows-7-and-windows-server-2008-r2-march-10-2015-d1b1b28c-b7fa-2902-f5a2-dc533812df7a

Mohamed Ali | VUG leader | VMCE 2024, VCP-DCV, CCP-V
Chris.Childerhose
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  • Chris.Childerhose
  • Veeam Legend, Veeam Vanguard
  • 9587 comments
  • October 22, 2025

​@rifkifn  - just wanted to follow up and see if you were able to get an answer from this thread? If so please mark the best answer or if you figured it out post the answer then mark that one as the best answer.

Chris Childerhose - VMCA2024 | VMCE2023 | VMCE-SP2024 | Veeam Vanguard 8* | Veeam Legend 5* | VUG Canada Leader | vExpert 6* | Toronto VMUG Leader | VCAP-DCV/VCP-DCV | Object First Ace | Cisco Champion | Twitter: @cchilderhose | Blog Site – https://just-virtualization.tech


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