[Solved] vSphere HA Agent Cannot Be Installed or Configured

vSphere HA is a crucial feature in VMware's virtualization ecosystem that ensures the availability of VMs. This article will delve into the causes of vSphere HA agent installation and configuration errors and provide solutions to resolve them.


By Zelia / Updated on September 11, 2023

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What is HA in VMware vSphere

HA, or High Availability, in VMware vSphere is a critical feature designed to enhance the reliability and availability of virtualized environments by providing automatic recovery in the event of hardware or software failures. VMware HA ensures that virtual machines continue to operate without significant disruption even if the physical host server hosting them fails.


Causes of vSphere HA agent cannot be installed or configured

There are several potential causes for errors when attempting to install or configure the vSphere HA agent in a VMware vSphere environment. These issues can prevent the successful installation or configuration of the HA agent, hindering its ability to provide high availability for virtual machines. Here are some common causes of vSphere HA agent cannot be correctly installed or configured:

  • Network Issues: Networking problems, such as wrong network configuration, firewalls, or DNS issues, can prevent the HA agent from communicating with other hosts and the vCenter Server.
  • Incompatible Hardware or Software: Compatibility issues between hardware components or outdated software can hinder the installation or proper functioning of the HA agent.
  • Resource Constraints: Insufficient CPU, memory, or storage resources on a host server may prevent the HA agent from installing or running correctly.
  • vCenter Server Connectivity: A lack of connectivity between the host server and the vCenter Server can impede the agent's installation and configuration.
  • Configuration Errors: Mistakes made during the initial cluster setup or misconfigurations within the HA settings can lead to errors.

How to fix error vSphere HA agent cannot be installed or configured

Fixing errors related to the installation or configuration of the vSphere HA agent in a VMware vSphere environment requires a systematic troubleshooting approach. Here are steps you can take to resolve the error vSphere HA agent cannot be installed or configured:

To address the issue on all affected ESXi hosts, re-run the upgrade using the below procedure (This solution is intended for hosts running ESXi versions older than 7.03P06. ):

1. Initiate Maintenance Mode on the ESXi host.

2. Rerun the upgrade by executing the following command to install the missing VIBs:

esxcli software profile update -d -p -f

Note: To obtain a list of all available image profiles within the ZIP file, utilize the following command: esxcli software sources profile list -d .

3. Reboot the ESXi host.

4. Configure vSphere HA.

How to configure HA in VMware vSphere

Configuring High Availability (HA) in VMware vSphere is a critical step to ensure the availability of virtual machines (VMs) in case vSphere HA agent on the host is disabled. Here is a step-by-step guide on how to enable HA in VMware vSphere:

1. Launch the VMware vSphere Client in your web browser. Proceed to the Hosts and Clusters section and locate your specific cluster.

2. In the Navigator pane, right-click the cluster name. Then click Settings in the context menu.


3. On the Configure page for your cluster, navigate to the Services section and opt for vSphere Availability.

4. Locate the vSphere Availability section, which is currently turned off, and select Edit.


5. Enable the High Availability feature by toggling the switch adjacent to vSphere HA.


Reliable and professional solution for vSphere VMs backup and restore

In addition to resolving vSphere HA agent installation and configuration errors, it is essential to have a reliable and professional solution for backing up and restoring your VMs. Data loss can occur due to various reasons, including hardware failures, accidental deletions, or software glitches. To protect your virtualized environment, consider using backup and recovery solutions specifically designed for VMware vSphere, like AOMEI Cyber Backup.

AOMEI Cyber Backup is a reliable and feature-rich backup solution tailored for VMware vSphere environments. It offers robust protection for your vSphere VMs, ensuring data integrity and business continuity. Whether you're managing a small virtualized environment or a large-scale enterprise infrastructure, AOMEI Cyber Backup provides the tools needed to efficiently and securely back up and recover vSphere VMs, offering the following benefits:

♢ Agentless Backup: Create complete and independent image-level backup for VMware ESXi and Hyper-V VMs.
♢ Flexible vSphere Backup: Batch backup large numbers of VMs managed by vCenter Server, or multiple VMs on a standalone ESXi host.
♢ Multiple Storage Destinations: Backup to local drive, or network destinations like Windows share or NAS.
♢ Automated Execution: Create backup schedules to automate backups daily, weekly, monthly.
♢ Instant Recovery: Restore a VM to its previous state quickly with simple clicks.

AOMEI Cyber Backup supports VMware ESXi 6.0 and later versions. Next, I will show you how to performvSphere VM backup and restorevia AOMEI Cyber Backup. You can click the following button todownload the free trial.

Download Free TrialVMware ESXi & Hyper-V
Secure Download

*You can choose to install this VM backup software on either Windows or Linux system.

Step 1. Access to AOMEI Cyber Backup web client, select Source Device, click VMware to Add VMware Device. Then Add vCenter or Standalone ESXi to add a host. And then click to Bind Device.


Step 2. Create Backup Task: Navigate to Backup Task and Create New Task. Then select VMware ESXi Backup for Backup Type. After that, set the Task Name, Device, Target, Schedule and Cleanup according to your need.


Step 3. Click Start Backup and choose Add the schedule and start backup now or Add the schedule only.


Step 4. When your backups are completed, it’s easy to restore your virtual machines to another place when a disaster strikes. Navigate to Start Restore, you can change restore location here to create a new VM or restore virtual machines to another datstore/host.

✍ Restore to new location: You can choose to restore the backup from any history version, andcreate an identical new VM in the same or another datastore/host.



The vSphere HA agent is a critical component for ensuring high availability and minimizing downtime in virtualized environments. Errors during its installation and configuration can disrupt these essential functions. By addressing common causes, verifying network settings, ensuring hardware compatibility, allocating sufficient resources, and reviewing configuration settings, you can resolve vSphere HA agent errors effectively.

Moreover, don't forget the importance of implementing a professional backup solution for vSphere VMs to safeguard your data and ensure business continuity. Properly addressing these aspects will contribute to a stable and resilient virtual infrastructure.

Zelia · Editor
Zelia is an editor from AOMEI Technology.She mainly writes articles about virtual machine. Writing is one of her hobbies and she wants her articles to be seen by more people. In her spare time, she likes to draw and listen to music, and it is a pleasure for her to focus on her own world.