SSH Connect to NAS

I believe I solved the rsync command's initial connection issue by removing the offending entry in the computer's ./ssh/known_hosts file. Then connecting (rsync) saved the new fingerprint in the known_hosts file; but the connection closed. Then trying the rsync again, that time it asked for the password, but won't accept the password established.

rsync -h --progress --stats -r -tgo -p -l -D --update --delete-after /home/jim/TestFiles rsyncjim@192.168.0.215:/Backup/TestFiles/
The authenticity of host '192.168.0.215 (192.168.0.215)' can't be established.
ECDSA key fingerprint is 7c:d0:00:d3:8f:8d:ee:e9:6b:99:cd:b3:09:c6:bf:f9.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added '192.168.0.215' (ECDSA) to the list of known hosts.
Connection closed by 192.168.0.215
rsync: connection unexpectedly closed (0 bytes received so far) [sender]
rsync error: unexplained error (code 255) at io.c(605) [sender=3.0.9]

rsync -h --progress --stats -r -tgo -p -l -D --update --delete-after /home/jim/TestFiles rsyncjim@192.168.0.215:/Backup/TestFiles/
rsyncjim@192.168.0.215's password: 
Permission denied, please try again.
rsyncjim@192.168.0.215's password: 
Permission denied, please try again.
rsyncjim@192.168.0.215's password: 
Permission denied (publickey,password).
rsync: connection unexpectedly closed (0 bytes received so far) [sender]
rsync error: unexplained error (code 255) at io.c(605) [sender=3.0.9]

I know the password I am using is correct. SSH service is enabled on the NAS. I even disabled that to see what the impact is on the rsync command and it fails right away, so I turned SSH back On.

Do I need to add some entry to the computer's id_rsa.pub file, or some other SSH-related file on the computer for the NAS rsync user? if so, how?