DNS configuration not working

Products

• VMware vSphere ESXi

Issue/Introduction

Configured DNS not working on the ESXi host when specific IP address were added on the host firewall for DNS

nslookup shows the below errors

Error:- connection timed out; no servers could be reached.

Environment

ESXi 7.0

Resolution

Removed all the IPs and selected 'Allow connections from any IP address '.

 

Related link:- https://techdocs.broadcom.com/us/en/vmware-cis/vsphere/vsphere/7-0/vsphere-security-7-0/securing-esxi-hosts/customizing-hosts-with-the-security-profile/esxi-firewall-configuration/add-allowed-ip-addressed-flex.html