Error "Failed to sync with the vCenter agent on the host" on the ESXi host

Products

• VMware vCenter Server
• VMware vSphere ESXi

Issue/Introduction

ESXi host marked Not responding

/var/log/vmware/vpxd/vpxd.log shows similar entries as:

YYYY-MM-DDTHH:MM:SS.SSZ warning vpxd[18019] [Originator@6876 sub=IO.Connection opID=HB-SpecSync-host-1234@0-5ad534a5] Failed to resolve address; <resolver p:0x00007f4b10014eb0, 'esxi.example.com:443', next:(null)>, e: 125(Operation canceled), async: true, duration: 135098msec

Cause

vCenter is unable to resolve the DNS name of the ESXi hosts

Resolution

How to change/update DNS Server IP address for vCenter Server