APIPA and No connectivity on Windows VM running on ESXi

If you come across any issues with APIPA assignments on Windows VMs, you can simply resolve the Network connectivity issues with below steps. Since this ARP related issue is a known issue, this should work on most Windows systems.

  • Access Registry editor and locate the below path

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters

  • Click Edit > New, and click DWORD Value
  • Type ArpRetryCount
  • Modify the value and enter 0
  • Exit the Registry Editor
  • Shut down the Windows VM
  • Power on the VM and verify connectivity. 

vCenter 6.7 – error when adding new hosts

In Vcenter 6.7, when you try to add ESXi hosts you may end up with an error saying

“The certificate on 1 host could not be verified. The SHA1 thumbprints of the certificate is listed below. To continue connecting, manually verify this certificate and accept the thumbprint below”

In order to fix this issue, you simply can carry out below workarounds

  • Restart ESXi management agents
  • Fix Date/Time on the hosts
  • Verify/fix DNS entries of the host systems