ReFS Known Issues, Considerations, and Limitations

Known Issues Memory Management Issues Server 2016 and older Windows repositories using ReFS on Server 2016 without the September 2018 updates or older OS versions are known to have issues during backup job retention enforcement, which manifests as: The repository server becomes unresponsive or...

Failed to open VM attachment

Challenge Veeam ONE generates "Failed to open VM attachment" alarm. Cause Veeam ONE triggers " Failed to open VM attachment" alarm when the following Windows events are registered on the Hyper-V host: 12290 Microsoft-Windows-Hyper-V-Worker 12290 Microsoft-Windows-Hyper-V-SynthStor 12290...

vCenter Server Appliance - Backup/Restore Recommendations

Native File-Based Backup and Restore Recommended vCenter Server Appliance Data Integrity Best Practices recommends using the native file-based backup and restore operations to protect the vCenter Server Appliance. Review: VMware vSphere User Guide: Considerations and Limitations for File-Based...

HotAdd Error: Failed to allocate SCSI target ID

Challenge A VMware VM Backup job utilizing Virtual Appliance HotAdd Transport Mode fails when attempting to attach disks to the proxy with the error: Error: Agent: Failed to process method HotAdd.AttachDisks: Failed to open VDDK disk DATASTORE vmname/diskfile.vmdk is read-only mode - true Logon...

PowerShell Script Execution Troubleshooting Advice

Veeam Support Scope Per Veeam Support Policy: Custom script troubleshooting is not supported. What's in Scope: Confirming that the Veeam task executed the script. Assisting with Veeam PowerShell cmdlets not functioning as intended or documented. What's Out of Scope: Troubleshooting why a custom...

Slow Restore Performance With Direct SAN Mode

Challenge When performing an Entire VM Restore or Virtual Disk Restore using Direct SAN Restore, the performance may be sub-optimal when the restored Disk Type Setting is set to Thick lazy zeroed. Cause When using Direct SAN to restore a disk with its disk type set to Thick lazy zeroed, overall...

Release Notes for Veeam Backup & Replication 8.0 Update 2b

More Recent Version Available Please find the latest version of Veeam Backup & Replication here: Veeam Downloads - Latest Version Challenge Release Notes for Veeam Backup & Replication 8.0 Update 2b Cause Please confirm you are running version 8.0.0.807, 8.0.0.817, 8.0.0.831, 8.0.0.917, 8.0.0.201...

0x80042317 or Error: VSSControl: -2147212521

Challenge A task fails with the following error: Failed to prepare guest for hot backup. Error: VSSControl: -2147212521 Backup job failed. Discovery phase failed. Cannot add volumes to the snapshot set. Cannot add a volume to the snapshot set. Volume name:...

"VM MAC address conflict" and "VM instance UUID conflict" alarms

Challenge During replication jobs, Veeam ONE triggers the VM MAC address conflict and VM instance UUID conflict alarms. Cause These alarms occur when Veeam ONE detects the following events within the vSphere Environment: VmStaticMacConflictEvent VmMacConflictEvent VmInstanceUuidConflictEvent Thes...

Unable to use VMR files from an earlier Veeam Reporter version

Challenge VMR files from earlier versions of Veeam Reporter are not supported. Cause VMR files from earlier versions of Veeam Reporter are not compatible with the сurrent version of Veeam ONE. Solution Create new VMR files. More Information If you have any questions or problems, contact Veeam...

The specified transports are not available

Challenge The SAN or Virtual Appliance mode intermittently fails with the error: Error: Client error: The specified transports are not available. Available transports: nbd. Specified transports: san. VMDK path: Datastore VMname/VMName.vmdk. The following entries can be seen in the VeeamAgent log:...

Reverse incremental job scheduling does not work properly

Challenge Reverse incremental job starts ignoring their scheduled settings, and run on the days selected for Synthetic Fulls, even when the check-box is grayed out. Solution To resolve the issue you need to enable forward incremental mode in the job settings and deselect "Enable synthetic fulls"...

SureBackup Performance Considerations

Purpose This article provides advice and information on understanding and improving SureBackup performance. Solution SureBackup Performance Considerations The Repository where the backup files are stored, and the Mount Server used by that Repository, should be in the same data center as the ESXi...

Failed to open VDDK disk error in Virtual Appliance mode, IDE virtual disks not supported

Processing the VM with IDE virtual disks in VA/hotadd mode fails...

When you open the nworks Web UI in a browser, you see a blank screen.

When you open the nworks Web UI in a browser, you see a blank screen instead of the logon screen/management screen. You may also see a Java exception stating that you need to add the site to the Trusted Sites zone...

Release Information for Veeam Plug-In for AWS 10 Patches

Release Information 10.2.0.11 2026-08-25 What's New Security and Performance Third-party libraries and packages were updated to address their discovered vulnerabilities. Overall stability and product security have been improved. 10.1.0.41 2026-05-27 What's New Security and Performance Third-party...

Exchange Backup Jobs Run Longer Than Expected or Fail with: Contract schema check for the Exchange Online REST API failed

Challenge Exchange backup jobs in Veeam Backup for Microsoft 365 or Veeam Data Cloud for Microsoft 365 run far longer than expected or fail to complete. The job log contains the following warnings and errors: Warning: Failed to retrieve Exchange Online REST API cmdlet information Warning: HTTP...

How to create an External Client App to Connect Veeam Backup for Salesforce

Purpose This article documents how to create an External Client App ECA in Salesforce to integrate with Veeam Backup for Salesforce via Salesforce API. An ECA with proper permissions is required for Veeam Backup for Salesforce to integrate with Salesforce API using the OAuth 2.0 protocol. Solutio...

Malware and Ransomware Detection in M365

Availability Requirement Threat Detection is available to Veeam Data Cloud for Microsoft 365 customers with Premium or Advanced plans. Customers must opt in to AI settings to enable this feature. Contact your Veeam account team or see your plan details to confirm availability. Supported Workloads...

Azure Block Mode Export Failure Due to NetworkAccessPolicyIsDenyAll with Veeam Kasten

Challenge If using Veeam Kasten to protect persistent volumes provisioned with the Azure Disk CSI provisioner, and encounter the following error during the block mode export phase of a policy run: Failure in exporting restorepoint with log details similar to: Access not permitted for resource...

How to Back Up ARM Role Assignments with Veeam Backup for Entra ID

Challenge This article documents the additional configuration necessary to enable Veeam Backup for Microsoft Entra ID to back up relationships between protected resources and management groups as part of the backup scope. By default, Veeam Backup for Microsoft Entra ID does not back up...

Granular sudo Permissions for Management of Veeam Agent for Oracle Solaris

Purpose This article provides examples of granular 'sudo' configuration for the Linux account that will be used by Veeam Backup & Replication when managing Veeam Agent for Oracle Solaris deployments with a Protection Group. Solution The following granular sudo permissions were tested with Veeam...

How to Enable Changed Block Tracking for Guest Cluster on vSphere with Tanzu

Purpose Changed Block Tracking is a VMware feature that tracks changes in virtual disks. Veeam Kasten for Kubernetes uses this feature in vSphere with Tanzu Guest Clusters to efficiently back up Persistent Volumes. Enabling Changed Block Tracking in each Supervisor Cluster where Veeam Kasten for...

New Readiness Check - Multiple Veeam Backup Servers Are Required by One Recovery Plan

Article Applicability This article documents a new Plan Readiness Check parameter in Veeam Recovery Orchestrator 7.1. Purpose This article documents a new addition to the Plan Readiness Check in Veeam Recovery Orchestrator VRO v7.1. This new check will be part of the Plan Readiness Check for all...

Release Information for Veeam Plug-In for Microsoft Azure 6 Patch 1

Requirements Please confirm that you are running version Veeam Plug-In for Microsoft Azure 6 build 6.0.0.234 or later before upgrading. You can find the currently installed build number Server version in the About section under Configuration | Support Information | Updates. After installing Veeam...

ORA-27515 Error During Managed Application Backup Policy Run

Challenge Running a managed backup policy with Veeam Plugin for Oracle RMAN results in job failure: Failed to execute plug-in manager command: RMAN-03002: failure of backup command at 07/13/2023 Plugin logs /tmp/veeampluginlogs and database trace files reference ORA-27515 error: $ grep ORA-27515...

VMXNET3 Drivers Missing From Recovery Media for Server 2022 vSphere VM

Challenge When attempting to perform a Bare Metal Restore on a vSphere VM using Veeam Recovery Media, which was created from a vSphere VM running Server 2022, the network adapter drivers fail to load. This issue persists despite having the 'Include hardware drivers from this computer' option...

Full Restore Point Generated by Veeam Agent for Microsoft Windows Cluster Backup Is Larger Than Source Cluster

Challenge The Backup Job for a Failover Cluster, or its associated Backup Copy Job, generates full .vbk restore points that are larger than the source Failover Cluster. Cause During the cluster backup, Veeam Agent for Microsoft Windows will deduplicate the blocks within shared disks. However, if...

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...

Export report email from Veeam Explorer for Microsoft Exchange is sent in an unexpected language

Challenge Export reports sent by Veeam Explorer for Microsoft Exchange are illegible or unexpectedly contain Chinese characters. Cause The issue is caused by an encoding conflict. By default, Veeam Explorer for Microsoft Exchange uses UTF-16 character encoding, and the issue appears under followi...

General HCI Storage & Veeam CDP support status

Veeam CDP supports the following HCI Storage systems: HPE dHCI HPE Simplivity NetApp HCI Cisco HyperFlex requirements see KB4093 Nutanix AOS with VMware vSphere If this KB article did not resolve your issue or you need further assistance with Veeam software, please create a Veeam Support Case. To...

Backup Jobs Fail After RDX Cartridge Is Swapped

Challenge When a backup repository is backed by an RDX removable storage device, the backup job may fail after the cartridge is swapped because the previously written backup file cannot be found on the new cartridge. Cause This issue occurs because repositories are not configured to be backed by...

“Secondary index is corrupt" error in ConnectWise Manage plugin after upgrading to Windows 10 version 2004

Challenge After upgrading the machine where Veeam Service Provider Console is installed to Windows 10 version 2004, ConnectWise Manage plugin stops working with the following error: "Secondary index is corrupt. The database must be defragmented or the affected index must be deleted. If the corrup...

How to Create IAM Role for Veeam Backup for AWS using Access Keys

How to create the required IAM role using Add IAM Role wizard and Access Keys...

How to enable Fast Clone functionality with Veeam Availability for Nutanix Mine

End-of-Life Product Nutanix Mine with Veeam reached End-of-Life on 2026-04-30. As of this date, all support services for this product are unavailable. For more information, see the Nutanix EOL Announcement Bulletin - Nutanix Mine, released 2025-04-30. Challenge Fast Clone is the Veeam Backup &...

How to set up multi-factor authentication (MFA) for Veeam Agent for Microsoft Windows

Article Applicability This article concerns a feature only available in Veeam Agent for Microsoft Windows 5 and older. The option to backup to OneDrive was deprecated in Veeam Agent for Microsoft Windows 6. As an alternative, Veeam Agent for Microsoft Windows 6 has introduced an Object Storage...

Job fails to create VSS snapshot for SMB share

Challenge A File Backup/file to tape job skips VSS snapshot creation on SMB share and ends with the following message in the log: Failed to create a VSS snapshot, failing over to direct backup from the file share A File Backup job for an SMB3 File Share configured to use Backup from a Microsoft V...

File to tape job significantly slows down due to garbage collection operations

Challenge A file to tape job significantly slows down after some time of processing. The source disks and the Veeam database are under a low load, CPU is not overloaded either. Available RAM on the Veeam server is around 10% or lower. Cause When available RAM on the Veeam server reaches a certain...

Procedure to migrate a Cloud Connect tenant to vCloud Director

Challenge SPs who have vCloud Director deployed in their infrastructure can expose vCloud Director resources as cloud hosts for tenant VM replicas. This article describes a procedure of migrating existing tenants to vCloud Director. Solution On the Tenant side: 1. Delete all Cloud Backup and...

Damaged unpacked_data.txt File Causes Veeam Guest Catalog Service to Not Start

Article Applicability There are many reasons why the Veeam Guest Catalog Service may fail to start, and this KB Article is relevant only when the error shown in the Challenge section is found within the Svc.VeeamCatalog.log file. Challenge The Veeam Guest Catalog Service fails to start and the...

Specified database is not valid

Challenge When installing Veeam ONE using an existing or migrated database, the following error occurs: Specified database is not valid. Please choose Veeam ONE database or create a new database to proceed. Cause This error message occurs when the Veeam ONE installer attempts to install using an...

File-Level Restore - FUSE mount is not supported on kernel versions 4.0.0-4.1.33

This issue is related to a known kernel bug and affects any version of Veeam Agent for Linux. Challenge When performing guest file recovery from a backup of a machine running Linux Kernel versions 4.0.0 through 4.1.33, the restore fails to mount with the error: FUSE mount is not supported on kern...

Unable to set acceptance level of partner due to installed VIBs having a lower acceptance level.

Article Repurposed Before this article's update in 2025, this article contained information about "Creating a VMware ESXi extension VIB for Veeam Backup from Storage Snapshot with Cisco HyperFlex IOvisor processing." Those directions were removed as the VIB extension only needed to be created for...

Veeam ONE 9.5 compatibility with Veeam Cloud Connect 9.5 Update 2

Challenge Veeam ONE needs to support Veeam Cloud Connect 9.5 Update 2 monitoring. There is a fix that has to be deployed on the Veeam ONE server monitoring the Cloud Connect server of the service provider Cause There are new types of data implemented with the release of Veeam Cloud Connect 9.5...

Unable to Back Up Disk X: Due to Invalid Partition Table

Challenge The backup job fails with the following error: Unable to back up disk X: due to invalid partition table Cause The error is caused by a volume type with no partition table and is not supported by Veeam Agent for Microsoft Windows. In Windows Disk Management, the volume looks like a commo...

Backup jobs stop working with NetApp SteelStore Cloud Integrated storage after upgrading to Veeam version 9

Challenge Aafter upgrading Veeam Backup & Replication to version 9, backup jobs to a NetApp repository based on a SteelStore host platform fail. The following error message can be seen in the job logs: " Error File not found. File name: \\PathToShare\BackupFolder\JobName.vbm" The NetApp log...

Veeam Management Pack 8.0 for System Center Update 1 Release Notes

Challenge Release Notes for Veeam Management Pack 8.0 for System Center Update 1. Cause Please confirm you are running Veeam Management Pack 8.0 prior to installing this update. You can check this in Operations Manager console under Administration | Management Packs, the build number should be...

Entire VM restore fails with 'An error occurred while taking a snapshot: Error.'

Challenge Entire VM Restore fails with: An error occurred while taking a snapshot: Error. Cause This can occur when a workingDir entry in the VMX causes the VM to attempt to direct snapshots to a different datastore that is not present in the site where the restore is taking place. Solution To...

How To Export Windows Event Logs

Purpose When submitting a support case for technical assistance, it is sometimes necessary to upload relevant Windows event logs in addition to the Veeam logs. Event logs exported using default settings can be missing important information. This article describes three different methods of...

Hyper-V backup job fails to create shadow copy with default shadow storage limit

Challenge Backup or replication of a Hyper-V VM fails. In the Windows event logs on the Hyper-V host server, there is an error with ID 8193 from source VSS: Volume Shadow Copy Service error: Unexpected error calling routine Cannot find anymore diff area candidates for volume...