vSphere HA agent on host cannot reach some management network addresses of other hosts

Products

• VMware vSphere ESXi
• VMware vCenter Server

Issue/Introduction

Following alert is triggered on the ESXi host(s):

vSphere HA agent on host cannot reach some management network addresses of other hosts

Environment

vCenter Server
vSphere ESXi

Cause

This alert is observed when an ESXi host is unable to reach/ping the Management IP address of the other ESXi hosts in the cluster where vSphere HA is enabled. 

On the ESXi host, multiple VMkernel adapters have Management service enabled on it.

Having Management service enabled on multiple VMkernel adapters creates conflict with vSphere HA communication as an ESXi host can choose any one VMkernel adapter which has Management Service enabled on it.

Resolution

Ensure that the management service is enabled on only one VMkernel adapter.

Additional Information

Networks Used for vSphere HA Communications