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Why does ESXi host shutdown fail if the DNS server is offline?

Issue:
PowerChute fails to shut down ESXi host/s when the DNS server is offline.

Product Line:
PowerChute Business Edition Agent versions 9.0.3, 9.1.1, 9.2, 9.2.1, 9.5, 10.x
PowerChute Network Shutdown versions 2.2.3, 2.2.4, 3.0, 3.0.1

Environment:
VMware Virtual Management Assistant (vMA)

Cause:
PowerChute runs a script that pulls the host name/s from vifptarget library. If the DNS server is running as a virtual machine (VM) and has been shut down or the DNS server is offline, the ESXi host name/s cannot be resolved, causing the shutdown to fail.

NOTE: PowerChute Network Shutdown version 3.1 and 4.x do not utilize vifptarget library. If running older versions of PowerChute Network Shutdown, we recommend updating to the latest version.

Comparability information for PowerChute Network Shutdown can be found here.

To download the latest version of PowerChute Network Shutdown click here.

Solution:
Add the ESXi host/s to /etc/hosts file