You can review the support bundle log messages to identify the upgrade problem.

You can also perform any of the following debugging tasks.
  • Log in to the NSX Manager CLI as root user and navigate to the upgrade coordinator log files /var/log/upgrade-coordinator/upgrade-coordinator.log.
  • Navigate to the system log files /var/log/syslog or API log files /var/log/proton/nsxapi.log.
  • Configure a remote logging server and send log messages for troubleshooting. See NSX Administration Guide.
Note: If you are unable to troubleshoot the failure and want to revert to the previous working version of NSX, contact VMware support.