---
title: "com.vmware.vc.HA.ClusterContainsIncompatibleHosts"
description: "HA cluster contains ESX/ESXi 3.5 hosts and more recent host versions, which is not fully supported. There is an issue with vSphere High Availability configuration for this cluster. Review the event description for detail on the cause."
canonical: "https://helpcenter.veeam.com/docs/mp/kb/com.vmware.vc.ha.clustercontainsincompatiblehosts.html"
breadcrumb: "Veeam MP for VMware Online Knowledge Base > Event-Based Rules > vSphere Cluster Warning > com.vmware.vc.HA.ClusterContainsIncompatibleHosts"
dateModified: "2026-09-10"
---

# com.vmware.vc.HA.ClusterContainsIncompatibleHosts

## Summary

HA cluster contains ESX/ESXi 3.5 hosts and more recent host versions, which is not fully supported.

## Causes

There is an issue with vSphere High Availability configuration for this cluster. Review the event description for detail on the cause.

## Resolutions

See VMware online documents such as [Troubleshooting VMware High Availability](https://knowledge.broadcom.com/external/article/318936/troubleshooting-vmware-high-availability.html) and the [vSphere Troubleshooting Guide](https://docs.vmware.com/en/VMware-vSphere/7.0/com.vmware.vsphere.networking.doc/GUID-DE119813-63A7-4B68-924D-1ED95F6EFFD7.html) to resolve HA issues.

## External

Refer to the online [vSphere Availability Guide](https://docs.vmware.com/en/VMware-vSphere/7.0/com.vmware.vsphere.avail.doc/GUID-63F459B7-8884-4818-8872-C9753B2E0215.html) for further guidance.