Nats: invalid connection

Hello.
I am trying to install Pydio Cells in VPS server with Debian 10, IP.IP.IP.IP is the public IP
I got the following error:

ERROR pydio.rest.install Could not run {“error”: “nats: invalid connection”}

You can help me ?

Hello,

Nats opens 4222 port. Please make sure that you don’t have service which are using 4222