rsync에러...ㅜㅜ

rsync를 써서 백업을 하려고 하는데 에러가 계속 나오고 있습니다.
문제점이무엇인지 찾지를 못하고 있는지라..ㅜㅜ
이런경우 어떻게 처리해야 할까요.
바쁘시더라도 시간을 내서 이 우매한 인간을 깨우쳐 주시길...

[BACKUP]
path = /wwwhome
comment = BACKUP
uid = root
gid = root
use chroot = yes
read only = yes
hosts.allow = 211.11.11.11
max connection = 15
timeout = 600
=======================================================
rsync -azrt --delete 210.11.11.11:BACKUP /backup/

Connection refused
rsync: connection unexpectedly closed (0 bytes read so far)
rsync error: error in rsync protocol data stream (code 12) at io.c(165)
========================================================
rsync -azrt -e ssh --delete 211.11.11.11:BACKUP /backup/

ssh_exchange_identification: Connection closed by remote host
rsync: connection unexpectedly closed (0 bytes read so far)
rsync error: error in rsync protocol data stream (code 12) at io.c(165)
=========================================================