Can't get Rsync jog to run

I have two Rsync jobs configured but only one works.

Here is the command line for the one that works
username@192.117.17.100::terapool

Here is the one that doesn't work
username@192.117.17.100::nas

The error command I get is:
@ERROR: auth failed on module nas
rsync error: error starting client-server protocol (code 5) at main.c(1534) [sender=3.0.9]

I have also tried - username@192.117.17.100:/media/NASBACKUP & username@192.117.17.100/media/NASBACKUP (because I am a noob and don't quite understand the rsync syntax)
I received this error:
Host key verification failed.
rsync: connection unexpectedly closed (0 bytes received so far) [sender]
rsync error: unexplained error (code 255) at io.c(605) [sender=3.0.9]

Here is the rsycd.conf on the destination machine; terapool is a pool of a couple of pooled drives, NASBACKUP is a single drive (partition)

lock file = /var/run/rsync.lock
log file = /var/log/rsyncd.log
pid file = /var/run/rsyncd.pid

[terapool]
path = /mnt/terapool
comment = backups from OMV
uid = username
gid = username
read only = no
list = yes
auth users = username
secrets file = /etc/rsyncd.secrets
# hosts allow = 192.117.17.200/255.255.255.0

[nas]
path = /media/NASBACKUP
comment = backups from OMV 2
uid = username
gid = username
read only = no
list = yes
auth users = username

Thanks for any and all help

I found my solution - the password had been incorrectly entered. I found in the /var/log/rsyncd.log

Sorry for my noobness - I hope one day to overcome it