Veeam Support Knowledge Base
Dell Unity Storage - "Unable to validate the specified certificate (Error Code: 0x1000100)"

Dell Unity Storage - "Unable to validate the specified certificate (Error Code: 0x1000100)"

KB ID:	4733
Product:	Veeam Backup & Replication \| 12.3.1
Published:	2025-06-04
Last Modified:	2025-06-04

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Challenge

When attempting to add a Dell Unity Storage Appliance that has been upgraded to firmware version 5.5 to Veeam Backup & Replication or operate backups to such storage, the following error occurs:

Unable to validate the specified certificate (Error Code: 0x1000100)

Cause

An investigation by Veeam R&D has determined that the Dell Unity v5.5 firmware drops support for TLS 1.0/1.1. This creates a conflict because the default uemcli.exe used by Veeam Backup & Replication is version 3.0.1, which requires TLS 1.0/1.1 (this older version is used to ensure maximum backward compatibility).

Solution

Starting in Veeam Backup & Replication 12.3.1, a newer version of uemcli.exe is included, but not used by default. To force Veeam Backup & Replication to utilize the uemcli.exe version 5.4.0, which uses TLS 1.2, create or update the following registry value on the Veeam Backup Server:

Key Location: HKLM\SOFTWARE\Veeam\Veeam Backup and Replication
Value Name: VNXeUemcliPath
Value Type: String Value (REG_SZ)
Value Data: C:\Program Files\Veeam\Backup and Replication\Backup\EMC Unisphere CLI\5.4.0\uemcli.exe

The path provided assumes default installation location and that Veeam Backup & Replication 12.3.1 is installed.

PowerShell to create the registry value:

New-ItemProperty -Path 'HKLM:\SOFTWARE\Veeam\Veeam Backup and Replication\' -Name 'VNXeUemcliPath' -Value "C:\Program Files\Veeam\Backup and Replication\Backup\EMC Unisphere CLI\5.4.0\uemcli.exe" -PropertyType String -Force
                
            

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