Veeam Backup for Cloud Solutions Potential Data Loss

Challenge If, between the runs of a backup policy for a VM, a virtual disk is removed and added back to that same VM, data blocks belonging to that disk may be deleted from the backups during the retention process. This can lead to a data loss scenario. Impacted Product Versions: Veeam Backup for...

Veeam Cloud Service Provider Case Administrator FAQ

Intended Audience This article contains information that is relevant to Veeam Cloud Service Providers. If you are not a Veeam Cloud Service Provider, please review the following: KB2211: My Account Portal - Role Management FAQ Case Administrator Assignment Restrictions Attempting to assign a case...

Backup Fails With the Error “PKCS12 (PFX)”

Challenge A backup job fails with the error: PKCS12 PFX without a supplied password has exceeded maximum allowed iterations. See https://go.microsoft.com/fwlink/?linkid=2233907 for more information The issue may also manifest as a backup job being stuck in the queued state. In this specific case,...

Impact of tmux on Veeam Interactions With Linux OS

Purpose This article documents a known incompatibility between Veeam applications that initiate SSH connections to remote Linux machines and those Linux machines being configured to have tmux autorun when users connect. Connection Examples As stated, this issue affects all interactions wherein a...

Veeam ONE Database Calculator for Veeam Backup for Microsoft 365 Monitoring

New Interactive Calculator An updated interactive calculator is now available to replace the legacy Excel file included with this article. Veeam ONE Calculator Solution Summary This Veeam ONE database sizing calculator will help estimate the database size required to retain historical data when...

How to Configure the Azure Restore Proxy Appliance Size

Purpose This article documents how to override the default Azure Restore Proxy Appliance size. Challenge Attempting to restore a Linux workload fails to Microsoft Azure when using a proxy appliance size that is not available for subscriptions that have VM size limitations. The following error may...

Build Numbers and Versions of Veeam Service Provider Console

This KB article lists all versions of Veeam Service Provider Console and their respective build numbers. For more information on downloading the latest version of Veeam Service Provider Console, visit: Veeam Service Provider Console -- Current Version Download Page Veeam Service Provider Console ...

Failed to get guest OS path for newly attached disk there are 2 new disks with uuid

Challenge A backup job using a Linux-based VMware Backup Proxy fails with the error: Failed to get guest OS path for newly attached disk /.vmdk: there are 2 new disks with uuid Cause This error occurs when the Linux-based VMware Backup Proxy processing the virtual machine has multipath enabled...

Veeam Agent for Microsoft Windows Built-In Case Creation fails with "The request was aborted: Could not create SSL/TLS secure channel"

Article Applicability This article is regarding an issue that impacts Veeam Agent for Microsoft Windows build 5.0.0.4301 or older, and was fixed in build 5.0.1.4584. Challenge When attempting to open a support case using the Technical Support button within the Veeam Agent for Microsoft Windows...

How to Configure a Custom Text Banner for the Veeam Backup & Replication Console

Purpose This article documents enabling and configuring the "Classified Stripe," a feature that can be configured to prominently display a banner in all Veeam Backup & Replication Consoles that connect to the Veeam Backup Server, including remote consoles. Use Case Examples This is the default te...

The Console Does Not Appear After Being Launched

Challenge After launching the Veeam Backup & Replication Console, the splash screen appears, and the application is shown in the taskbar, but the Console does not appear, and the mouseover preview is blank. Cause The Console's window position is off the edge of the screen. When the Veeam Backup &...

Veeam Agent for Microsoft Windows Update Fails with "The digital signature of the downloaded update file is invalid"

Challenge The integrated Veeam Agent for Microsoft Windows Update check displays the error: The digital signature of the downloaded update file is invalid. Most likely, it got corrupted. Please, download the update again. An alternate message is a warning stating: Version is available but cannot ...

WDAC Supplemental Policy for Veeam Backup & Replication Components on Azure Local

Azure Local is the new name for Azure Stack HCI Azure Stack HCI is now considered part of Azure Local. Learn more about this rename in the Microsoft Documentation: Renaming Azure Stack HCI to Azure Local. Veeam Backup & Replication Version Requirement The solution documented in this article...

How to Set Custom VLAN ID in Recovery Media

Purpose This article documents how to configure the Veeam Agent for Microsoft Windows Recovery Media to use a specific VLAN ID. Use Case: You need to access a repository located in a different VLAN than the original machine was using. Solution Because the Recovery Media is based on WinPE, which...

Restore/Failover/SureBackup of Virtual Machines running Windows 8.1/Window Server 2012 R2 (or older) triggers chkdsk if Veeam Backup Server or Mount Server is Running Windows Server 2022 (or newer)

Challenge In the following scenarios, a Virtual Machine1 that was running Server 2012 R2/Windows 8.1 or lower will perform chkdsk on the first boot if the Veeam Backup Server is running Server 2022: A non-Domain Controller VM is being tested by SureBackup with the "Automatically disable Windows...

Unable to Add Object Storage With Versioning to Veeam Backup for Microsoft 365

Challenge When adding an Object Storage Repository, the following error occurs: The selected bucket supports blob versioning. Select a bucket with disabled blob versioning. Cause This issue occurs because the cloud storage has Versioning enabled. Starting with Veeam Backup for Microsoft 365 v7,...

Impact of Microsoft EWS Deprecation on Microsoft Teams backup

Challenge Due to a recent change deprecating an earlier API EWS, backups of Microsoft Teams may complete with a "Success" status, while no new channel posts were backed up. Solution As it was announced before, Microsoft is deprecating the ability for EWS APIs to access the TeamsMessagesData folde...

Backup Job Identifies Teams Tabs as Unsupported and Skip Them

Issue A backup job skips Microsoft Teams tabs from processing without displaying any error or warning. Cause Every tab in Microsoft Teams has an Application ID property, which is used by the backup jobs to determine which tabs are supported or unsupported. Due to recent changes, some supported...

Support Statement regarding Microsoft CVE-2023-24932

Challenge Microsoft recently released update KB5025885 containing changes to secure boot. These changes require specific actions to be taken to continue using Veeam Agent for Microsoft Windows bare metal recovery media and other restore operations. After applying the Microsoft Update with...

After removing and adding items from the OneDrive folder, Veeam Backup for Microsoft 365 may skip backup items

Challenge The Veeam Backup for Microsoft 365 Dev team has identified an issue where Veeam Backup for Microsoft 365 may skip items in a SharePoint Document Library or List when a large number of items are rapidly added, removed, and added again. For example, If a user adds 20 or more items to the...

Veeam Explorer for Microsoft Teams Error: "Tab type is not supported"

Challenge The Tenants of a Service Provider, who has recently upgraded to Veeam Backup for Microsoft 365 version 7.0.0.3604 P20230512, may receive the following error when attempting to restore using Veeam Explorer for Microsoft Teams: Tab type is not supported. Cause This error occurs because th...

Azure Storage Account Key Security Advisory

Purpose This article highlights a flaw in the design of Microsoft Azure roles that could lead to breaches between control and data planes. If a control plane user's account is compromised, it can be used to access and alter files stored in the storage accounts accessible to them. Cause The ListKe...

Unable to Select Clustered Instance When Configuring Backup

Article Applicability This article concerns a behavior observed when using Veeam Plug-in for Microsoft SQL Server. Challenge When selecting Databases to Backup Up, the Instance drop-box does not list an option for cluster \instance; instead , there is only an option for node \instance. In some ra...

The Veeam KB Resource Hub

Top 10 Most Popular KBs for Q1 2026 1. KB1832: How to Collect Logs for Veeam Backup & Replication 2. KB1999: Antivirus Exclusions for Veeam Backup & Replication 3. KB4687: Unable to Interact with Some Hypervisors and Cloud Platforms 4. KB1471: How to Manually Back Up Veeam Configuration Databases...

How to Test Port Connectivity

Purpose This article documents how to test connectivity between two machines over a specific port. Product Service Ports Most connection errors involving ports in the 61xx, 93xx, 94xx, and 10xxx ranges are related to Veeam product-related services. Determine if the port in the connection error is...

Release Information for Veeam Backup for Google Cloud 4 Patch 1

Requirements Before installing this patch, please confirm that you are running Veeam Backup for Google Cloud 4 build 4.0.0.1072. You can check your build number under Configuration | Support Information | About | Server version by clicking the gear icon at the top-right corner of the main menu in...

How to Collect Logs for Veeam Plug-in for Microsoft SQL Server

Purpose This article explains how to collect the logs required for a support case involving Veeam Plug-in for Microsoft SQL Server. Solution Quick Start Automated Veeam Plug-in for Microsoft SQL Server Log Collection If the Windows machines where Veeam Plug-in for Microsoft SQL Server is installe...

Release Information for Veeam Recovery Orchestrator 6 Cumulative Patches

Requirements This Cumulative Patch can be used to: update manually from a previous Veeam Recovery Orchestrator 6 release to the latest Cumulative Patch. upgrade an existing Veeam Recovery Orchestrator 5 server to Veeam Recovery Orchestrator 6 with the latest Cumulative Patch. install a new...

Backup of Microsoft Teams Fails With: Object reference not set to an instance of an object

Challenge Backup of Microsoft Teams in Veeam Backup for Microsoft 365 fails with the following error: Error: Object reference not set to an instance of an object. Copy Cause This issue is related to recent changes in the response syntax of the Microsoft Graph API to a specific request that Veeam...

Release Information for Veeam Backup for Nutanix AHV 4a

Requirements To upgrade to Veeam Backup for Nutanix AHV 4a, download the installer below and run it on the Veeam Backup & Replication server that manages the AHV Backup Appliances. The Veeam Backup for Nutanix AHV 4a Plug-In must be installed before updating the Nutanix AHV Backup Appliance. You...

StoreOnce and Veeam Immutability Compatibility

Challenge A backup job that targets an HPE StoreOnce Catalyst repository may display either of the following messages: In Veeam Backup & Replication 12.0, the job will fail and display the error: OSCLTERRIMMUTABLEEPOCHREQUESTEXCEEDSMAXIMUM. Err: -1817 In Veeam Backup & Replication 12.1, the job...

Release Information for Veeam Backup for Red Hat Virtualization 3a

This release was superseded by Veeam Backup for Red Hat Virtualization 3b. Requirements The Veeam Backup for Red Hat Virtualization 3a Plug-In may be used as part of a new deployment or to upgrade an existing Veeam Backup for Red Hat Virtualization Plug-In running versions 2.x - 3.x. After...

Release Information for Veeam Service Provider Console 7 Cumulative Patches

Newer Product Version Available A complete list of Veeam Service Provider Console versions and their release dates is available on KB4464: Build Numbers and Versions of Veeam Service Provider Console. Requirements Please confirm that you are running at least Veeam Service Provider Console 7 GA...

The remote server returned an error: (401) Unauthorized for Microsoft Loop SharePoint sites

Challenge The Backup of a SharePoint site displays the following error message: Failed to initialize site processing: /contentstorage /CSP, error: The remote server returned an error: 401 Unauthorized. The URL of SharePoint sites created by Microsoft Loop sites can be identified by the...

SharePoint backup jobs fail with: The remote server returned an error: (429)

After upgrading to Veeam Backup for Microsoft 365 7, backup jobs may fail with this error due to SharePoint Online throttling policy...

Antivirus Exclusions for Veeam Agent for Mac

Purpose This article documents antivirus exclusions that may be created to reduce the impact that antivirus software has on the functionality of Veeam Agent for Mac. Note: Antivirus will not always cause Veeam Agent for Mac functions to fail; antivirus software may also negatively impact backup...

Veeam Backup for Microsoft 365 Backup Copy May Fail to Transfer Microsoft Teams Channel Messages

Challenge Issue Summary In certain situations, when using a Backup Copy Job with an Archive Appliance to copy data from a Backup Job that was set up solely to protect Teams data via Teams Export APIs, the transfer of Teams channel messages may fail. Requirements for the Issue to Occur This issue...

How to use Veeam Backup for Nutanix AHV/Veeam Backup for Red Hat Virtualization Proxy with Internal CA Certificates

Article Applicability The need to perform the procedures documented in this article has been eliminated through improvements to how certificates are handled, starting in the following versions: Veeam Backup for Nutanix AHV 5 Veeam Backup for Oracle Linux Virtualization Manager and Red Hat...

After Enabling MFA, Veeam Backup Server Is Listed as Inaccessible in Veeam Service Provider Console

Challenge After enabling multi-factor authentication MFA in Veeam Backup & Replication or Veeam Cloud Connect, that server may become listed as "inaccessible" within Veeam Service Provider Console yet the Veeam Management Agent for VSPC continues to display a "healthy" status. Cause When MFA is...

After Upgrade to Veeam Backup & Replication 12, Storage Rescan of IBM HyperSwap Volume Fails

Challenge After upgrading to Veeam Backup & Replication 12, Storage Rescan fails with: Failed to update information about IBM HyperSwap volumes. Please ensure that volumes on both sides of IBM HyperSwap relationships are included in the rescan scope in the storage properties. See KB4380 for...

Veeam Agent for Linux 6 blksnap module - Xen PV/PVHVM filesystem corruption

Article Applicability This article is relevant only if the answer to all three of these questions is "Yes." 1. Is Veeam Agent for Linux 6 in use? 2. Is Veeam Agent for Linux installed within a Xen PV/PVHVM virtual machine, specifically Citrix XenServer or XCP-ng? 3. Is that virtual machine runnin...

Release Information for Veeam ONE 12 Cumulative Patches

This update was superseded by Veeam ONE 12.1. Requirements This Cumulative Patch can be used to: update from a previous Veeam ONE 12 release to the latest Cumulative Patch. upgrade an existing pre-12 Veeam ONEVeeam ONE 10a 10.0.2.1094 Veeam ONE 11 11.0.0.1379 Veeam ONE 11a 11.0.1.1880 server to...

How to Unhide the Restore Reason Page

Purpose This article documents how to unhide the Reason tab in the Restore Wizard after the "Do not show me this page again " option has been checked, causing the Reason tab to no longer appear during future restores. Solution The "Do not show me this page again" setting and other user-specific U...

Quantum DXi Storage With Firmware 3.x Does Not Work with Veeam Backup & Replication 12

Challenge When attempting to add Quantum DXi storage with firmware 3.x to Veeam Backup & Replication, the following error is shown: Failed to StartAgent: Failed to construct ClientAgentProtocol. If the Quantum DXi storage was added to Veeam Backup & Replication prior to upgrading to Veeam Backup ...

Veeam Kubernetes Service Fails to Start - Error 1064

Article Applicability The service start 'Error 1064' can occur for other reasons, and this article documents an issue that only happened with the Kasten K10 plug-in versions before 12.0.1.4. Review the cause section carefully to identify if this article is related. Challenge When the short date...

How to Migrate Veeam Backup Enterprise Manager's Database from Microsoft SQL to PostgreSQL

Purpose This article documents the migration of the Veeam Backup Enterprise Manager Enterprise Manager configuration database from Microsoft SQL to PostgreSQL. Notes: The migration process is one-way only. Migration can only be performed from Microsoft SQL to PostgreSQL. Note: Starting in Veeam...

Release Information for Veeam Backup for Microsoft 365 7 Cumulative Patches

This release has been superseded by Veeam Backup for Microsoft 365 7a. Requirements This Cumulative Patch can be used to: update manually from a previous Veeam Backup for Microsoft 365 7 release to the latest Cumulative Patch. upgrade an existing pre-7 Veeam Backup for Microsoft 365 server to Vee...

Veeam Agent Standalone Backup Fails with "Version string portion was too short or too long"

Challenge After upgrading Veeam Backup & Replication to version 12, the following tasks for Standalone Veeam Agent i.e., Veeam Agent for Microsoft Windows, Veeam Agent for Linux, Veeam Agent for IBM AIX, and Veeam Agent for Oracle Solaris deployments that existed before the upgrade may fail...

Veeam Backup for Microsoft 365 server license type is not compatible with Veeam ONE license type.

Challenge When attempting to add Veeam Backup for Microsoft 365 to Veeam ONE, the connection fails with: Failed to connect to "". Veeam Backup for Microsoft 365 server license type is not compatible with Veeam One license type. Cause As documented in the Veeam Backup for Microsoft 365 7 Release...

Release Information for Veeam Backup & Replication 12 Cumulative Patches

This update was superseded by Veeam Backup & Replication 12.3. Release Information Below are details about the Cumulative Patches that have been released for Veeam Backup & Replication 12. Each subsequent Cumulative Patch also includes all fixes present in the previous Cumulative Patches. P202307...