On 2017-09-06 07:18, Anton Torkunov wrote:
Hello everyone!
I've tried to backup host via rsyncd, but got error:  Backup aborted
(unexpected response: '')

rsyncd is well configured, because If I try to run just rsync,
everything is fine:

rsync  rsync://orange.vpn/root/
...
the listing files is here
...

It's a good troubleshooting step. Was this run from the same host? What does your rsyncd.conf look like?

Next, I've tried to run BackupPC_dump:
su backuppc -c "/usr/share/backuppc/bin/BackupPC_dump -v -f
orange.vpn"

cmdSystemOrEval: about to system /bin/ping -c 1 orange.vpn
cmdSystemOrEval: finished: got output PING orange.vpn (192.168.220.27)
56(84) bytes of data.
64 bytes from orange (192.168.220.27): icmp_seq=1 ttl=64 time=8.25 ms

--- orange.vpn ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 8.259/8.259/8.259/0.000 ms
...

CheckHostAlive: returning 9.026
full backup started for directory root

started full dump, share=root
Connected to orange.vpn:873, remote version 31
Negotiated protocol version 28
Error connecting to module root at orange.vpn:873: unexpected
response: ''
Got fatal error during xfer (unexpected response: '')
cmdSystemOrEval: about to system /bin/ping -c 1 orange.vpn
cmdSystemOrEval: finished: got output PING orange.vpn (192.168.220.27)
56(84) bytes of data.
64 bytes from orange (192.168.220.27): icmp_seq=1 ttl=64 time=7.38 ms
...
CheckHostAlive: returning 11.452
Backup aborted (unexpected response: '')
Not saving this as a partial backup since it has fewer files than the
prior one (got 0 and 0 files versus 0)
dump failed: unexpected response: ''

======
At the client side (rsyncd):

2017/09/06 17:10:52 [4780] name lookup failed for 192.168.220.23 [1]:
Name or service not known
2017/09/06 17:10:52 [4780] connect from UNKNOWN (192.168.220.23)
2017/09/06 17:10:52 [4780] rsync on root/ from UNKNOWN
(192.168.220.23)
2017/09/06 17:10:52 [4780] building file list
2017/09/06 17:10:52 [4780] sent 459 bytes  received 29 bytes  total
size 0
2017/09/06 17:12:59 [5305] name lookup failed for 192.168.220.23 [1]:
Name or service not known
2017/09/06 17:12:59 [5305] connect from UNKNOWN (192.168.220.23)
2017/09/06 17:13:04 [5305] rsync: safe_read failed to read 1 bytes
[Receiver]: Connection reset by peer (104)
2017/09/06 17:13:04 [5305] rsync error: error in rsync protocol data
stream (code 12) at io.c(276) [Receiver=3.1.1]
=======

Could you help me to fix the issue???

It may be instructive to examine the client side log from your successful session to see what's different.
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