---
title: "DasAgentUnavailableEvent"
description: "vCenter Server cannot contact any primary host in a HA cluster. vCenter Server lost contact to all primary nodes in the connected state."
canonical: "https://helpcenter.veeam.com/docs/mp/kb/dasagentunavailableevent.html"
breadcrumb: "Veeam MP for VMware Online Knowledge Base > Event-Based Rules > vSphere Cluster Error > DasAgentUnavailableEvent"
dateModified: "2026-09-10"
---

# DasAgentUnavailableEvent

## Summary

vCenter Server cannot contact any primary host in a HA cluster.

## Causes

vCenter Server lost contact to all primary nodes in the connected state. Further attempts to configure HA on the host will fail until a DasAgentFoundEvent is logged or unless this host is the first node to be configured.

## 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.