#1 Global Leader in Data Resilience
#1 Global Leader in Data Resilience
TRY NOW
book meeting
BACK TO KB LIST

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

KB ID: 4733
Product: Veeam Backup & Replication | 12.3.1 | 12.3.2 | 13
Published: 2025-06-04
Last Modified: 2025-07-10
mailbox
Get weekly article updates
By subscribing, you are agreeing to have your personal information managed in accordance with the terms of Veeam's Privacy Notice.

Cheers for trusting us with the spot in your mailbox!

Now you’re less likely to miss what’s been brewing in our knowledge base with this weekly digest

error icon

Oops! Something went wrong.

Please, try again later.

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 or higher 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
Use Only uemcli.exe Included with Veeam Backup & Replication

The VNXeUemcliPath registry value must point only to a uemcli.exe provided with Veeam Backup & Replication. Using any uemcli.exe other than those included with Veeam software is unsupported and may cause task failures.

Approved CLI packages can be found in:

C:\Program Files\Veeam\Backup and Replication\Backup\EMC Unisphere CLI\

More Information

In some support cases, it has been observed that this issue may persist even after setting the VNXeUemcliPath registry value. In those cases, it was found that customers had installed the Dell Unisphere CLI Tools, and the issue was only resolved after uninstalling the independently installed CLI Tools and removing the certificate files created by the Dell Unisphere CLI Tools installer in C:\Windows\SysWOW64\config\systemprofile\AppData\Local\.emc.

If this KB article did not resolve your issue or you need further assistance with Veeam software, please create a Veeam Support Case.

To submit feedback regarding this article, please click this link: Send Article Feedback
To report a typo on this page, highlight the typo with your mouse and press CTRL + Enter.

Spelling error in text

Thank you!

Thank you!

Your feedback has been received and will be reviewed.

Oops! Something went wrong.

Please, try again later.

You have selected too large block!

Please try select less.

KB Feedback/Suggestion

This form is only for KB Feedback/Suggestions, if you need help with the software open a support case
By submitting, you are agreeing to have your personal information managed in accordance with the terms of Veeam's Privacy Notice.
Verify your email to continue your product download
We've sent a verification code to:
  • Incorrect verification code. Please try again.
An email with a verification code was just sent to
Didn't receive the code? Click to resend in sec
Didn't receive the code? Click to resend
Start using Veeam:
Download the product
&
Activate the license key
Thank you!

Thank you!

Your feedback has been received and will be reviewed.

error icon

Oops! Something went wrong.

Please, try again later.