‘Out-of-band upgrade’ or ‘Out-of-band validation failed internally’

Products

• VMware SDDC Manager

Issue/Introduction

• After upgrading to version 5.2.2, the precheck error for Management domain or Workload Domains with the following errors:
  “Out-of-band upgrade” / “Out-of-band validation failed internally.”

Environment

VCF 5.2

Cause

The issue occurs because the /etc/hosts file contains additional or incorrect entries that are not part of the default configuration.

Resolution

To resolve the issue, replace the contents of the /etc/hosts file with the exact text below:

1. SSH to SDDC manager via vcf user
2. Switch to root user  su -
3. Empty the hosts file 
   1. cat /dev/null > /etc/hosts
4. vi /etc/hosts
5. Edit the hosts file so that it is exactly like the section below:
   
   # Begin /etc/hosts (network card version)

127.0.0.1 localhost.localdomain
127.0.0.1 localhost
127.0.0.1 photon# End /etc/hosts (network card version)
6. Save the file
7. Resume the upgrade.