NSX-T issue: Some appliance components are not functioning properly

One of the NSX-T nodes reporting "Some appliance components are not functioning properly" and web page is down.

Also could be some errors on the screen like:

Component health: SEARCH:UP, POLICY:UP, MANAGER:UNKNOWN, UI:UP, NODE_MGMT:UP.
Error code: 101

First, CLI to the applience and check if next services status:

If manager services for example is down tray to start it manually and if it fails check errors for manager.log using this command:
  get log-file manager.log

 

Assuming reboot alredy was in place.

 

If you need to detuch manangement plane:

For NSX-T 2.3 the command it: