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rsync: if a module is not found, what can I check?

I am trying to simply copy a file from to

I'm executing the following command from a ubuntu VM at ip (I'm trying to do a pull, if i'm not wrong in the term)

rsync rsync://realtebo@ /etc/pihole/black.list

In the .225 I created the pihole_conf as follows

realtebo@$ cat /etc/rsyncd.conf
comment = Pihole configuration
path = /etc/pihole
auth users = realtebo
hosts allow = *.ismyservice.com
hosts deny = * 
list = false 

This is the error

@ERROR: Unknown module 'pihole_conf'
rsync error: error starting client-server protocol (code 5) at main.c(1666) [Receiver=3.1.2]

I'd like an help to understand the source of the problem.