---
title: "com.vmware.vc.host.Crypto.ReqEnable.KMSClusterError"
description: "A host requires encryption mode enabled and the KMS cluster is not available. The connection between the vCenter Server and the KMS cluster failed. Manually check for the keys in the KMS cluster, and restore the connection to the KMS cluster."
canonical: "https://helpcenter.veeam.com/docs/mp/kb/com.vmware.vc.host.crypto.reqenable.kmsclustererror.html"
breadcrumb: "Veeam MP for VMware Online Knowledge Base > vCenter Server Alarms > Veeam VMware: Host Requires Encryption Mode Enabled Alarm > com.vmware.vc.host.Crypto.ReqEnable.KMSClusterError"
dateModified: "2026-09-10"
---

# com.vmware.vc.host.Crypto.ReqEnable.KMSClusterError

## Summary

A host requires encryption mode enabled and the KMS cluster is not available.

## Causes

The connection between the vCenter Server and the KMS cluster failed.

## Resolution

Manually check for the keys in the KMS cluster, and restore the connection to the KMS cluster.

## External

Refer to [VMware Online Documentation](https://docs.vmware.com/en/VMware-vSphere/7.0/com.vmware.vsphere.security.doc/GUID-BCD15E94-4BB5-4A85-9B0B-7A387D54FB5C.html) for more information.