NSX host upgrade fails with: Failed to place host <host> in maintenance mode. Please check the state of the host in vCenter

Products

• VMware NSX

Issue/Introduction

• Upgrade of NSX from 4.2.1 to 4.2.3 is failing on a host with error:
  
  Failed to place host <host> in maintenance mode. Please check the state of the host in vCenter.
  
  
• From within vCenter, the host shows as unresponsive.
• vCenter can connect to host over port 443 and 902.
  
  root@vc [ ~ ]# nc -vz [Host] 443
[Host] [IP] 443 (https) open

root@vc [ ~ ]# nc -vz [Host] 902
[Host] [IP] 902 (ideafarm-door) open
• hostd and vpxa are both running on host.
  
  [root@[host]:/etc/init.d] /etc/init.d/vpxa status
vpxa is running

[root@[host]:/etc/init.d] /etc/init.d/hostd status
hostd is running.
  
  

Environment

VMware NSX
VMware ESX

Resolution

Workaround: 

Reboot host