ESXi host disconnects intermittently from vCenter if there are multiple A and PTR records in DNS

Products

• VMware vSphere ESXi
• VMware vCenter Server

Issue/Introduction

• ESXi host disconnects intermittently from vCenter Server
  
  
• Performing nslookup of the hostname of the ESXi in the command prompt of the windows jump server and it returns an incorrect IP address or returning two IP addresses where one of them is a incorrect/duplicate IP
  
  
• Two IP addresses of the ESXi host is returned to vCenter but one of them is non-working IP address:

nslookup <Hostname of ESXi>
Working IP Address :  ##.###.##.##.###
Non-working IP Address :  ##.###.##.##.###

In vCenter server: /var/log/vmware/vpxd/vpxd.log

YYYY-MM-DDThh:mm:ss:uuu warning vpxd[63037] [Originator@6876 sub=MoHost opID=HostSync-host-37931-7f75b4b7] host [vim.HostSystem:host-37931,] connection state changed to NO_RESPONSE

YYYY-MM-DDThh:mm:ss:uuu warning vpxd[64705] [Originator@6876 sub=MoHost opID=HostSync-host-37931-73b9cd07] host [vim.HostSystem:host-37931,] connection state changed to NO_RESPONSE

YYYY-MM-DDThh:mm:ss:uuu warning vpxd[64784] [Originator@6876 sub=IO.Connection opID=HB-host-37931@1686-52d66fc6-SWI-4b70ddca] Failed to connect; <io_obj p:0x00007f4dd49726c8, h:152, <TCP '##.###.##.##.### : (port)'>, <TCP '##.###.##.##.### : (port)'>>, e: 110(Connection timed out), duration: 31436msec

Environment

• vCenter 7.x
• vCenter 8.x
• vCenter 9.x
• ESXi 7.x
• ESXi 8.x
• ESX 9.x

Cause

The issue arises when vCenter Server receives multiple A and PTR records for a specific ESXi host.

While attempting to connect to one of these records, vCenter Server encounters an unreachable IP address.

Resolution

To resolve the issue delete the incorrect PTR records in the DNS server.