How to configure NS Chat?

NethServer Version: 7.8.2003
Module: nethserver-ejabberd-1.8.2-1

Hello, I’m trying to configure a NS VM as Chat server. Using the web UI, I installed nethserver-ejabberd module on a NS VM bound to a remote Active Directory account provider (ldapservice as a dedicated user account in AD), I installed Pidging in Linux Mint 19.1 using apt install pidgin --install-recommends. After finishing installation I configured my user like this.

However I’m getting disconnected from time to time: