Acronis Agent for ESX/ESXi (Virtual Appliance) builds 11639 and higher is officially certified by VMware

The problem is in incorrect SSL certificate generation for intercomponent connections of Acronis products. As workaround, try disabling SSL encryption

Installation of Acronis Product Fails with "Failed to Grant Access to the Agent Certificate" Install Error in MSI Log. This article provides information on how to find, identify and resolve typical errors in MSI logs of Acronis software.

Acronis Backup for VMware web server uses self-signed certificates

Remove Acronis Storage Node from Acronis Management Server and add it back to fix the issue

The online server is temporarily down. Please reattempt the backup in ten minutes or later


1. Backup to Acronis Cloud fails.

2. When you click on X to check the error details, one of the following messages is displayed:

  1. The last backup has failed

    The server rejected the renewed certificate


  1. You are attempting to install Acronis Backup & Recovery 10 Agent for Windows or Acronis Disk Director 11 Advanced;
  2. The installation starts, but then rolls back;
  3. In the installation log you search for the Return value 3 entry (for operating systems in English) and you see the following error entries:

    (!) For complete information on how to analyze installation logs, please see Analyzing Installation Logs of Acronis Products Based on MSI Technology.


Starting from Update 4 (Build 12730) all communication during a device registration is done via HTTPS. It works out of the box and cannot be disabled.

The knowledge base article provides the possible scenarios when certificate or private key file might not be accepted as valid for URL branding request.


Backup or another activity fails with:

Failed to establish connection with cloud storage.

In Error Details of the error, you see the following message:

"ErrorNotFound('No certificate was found for authority with id"


Backup to partner-hosted storage (Backup Gateway) fails with:

Failed to get information about the archives. Access to the file is denied


This article provides troubleshooting steps for issues with backup to Acronis Cloud storage using Acronis True Image and Acronis Cyber Protect Home Office


1. Backup to Acronis Cloud fails.

2. When you click on the red X or || icon to see details, one of the following messages is shown: