SSH problem

I have been using rsnapshot to backup files from another machine at a local address (192.168.1.3) successfully. When I switch it to a public IP address (xxx.no-ip.biz), it encountered SSH errors that I couldn't resolve. Could anyone give me some clues on the problem?

Here is the SSH debug:

Zitat

OpenSSH_5.5p1 Debian-6+squeeze5, OpenSSL 0.9.8o 01 Jun 2010
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: Applying options for *
debug1: Connecting to xxx.no-ip.biz [xxx] port 15223.
debug1: Connection established.
debug1: permanently_set_uid: 0/0
debug1: identity file /var/lib/openmediavault/cron.d/.ssh/n40l_backup type -1
debug1: identity file /var/lib/openmediavault/cron.d/.ssh/n40l_backup-cert type -1
debug1: Remote protocol version 2.0, remote software version OpenSSH_5.5p1 Debian-6+squeeze5
debug1: match: OpenSSH_5.5p1 Debian-6+squeeze5 pat OpenSSH*
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_5.5p1 Debian-6+squeeze5
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug1: kex: server->client aes128-ctr hmac-md5 none
debug1: kex: client->server aes128-ctr hmac-md5 none
debug1: SSH2_MSG_KEX_DH_GEX_REQUEST(1024<1024<8192) sent
debug1: expecting SSH2_MSG_KEX_DH_GEX_GROUP
debug1: SSH2_MSG_KEX_DH_GEX_INIT sent
debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY
debug1: Host '[xxx.no-ip.biz]:15223' is known and matches the RSA host key.
debug1: Found key in /root/.ssh/known_hosts:6
debug1: ssh_rsa_verify: signature correct
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug1: SSH2_MSG_NEWKEYS received
debug1: Roaming not allowed by server
debug1: SSH2_MSG_SERVICE_REQUEST sent
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug1: Authentications that can continue: publickey
debug1: Next authentication method: publickey
debug1: Trying private key: /var/lib/openmediavault/cron.d/.ssh/n40l_backup
debug1: read PEM private key done: type RSA
debug1: Authentications that can continue: publickey
debug1: No more authentication methods to try.
Permission denied (publickey).
rsync: connection unexpectedly closed (0 bytes received so far) [Receiver]
rsync error: unexplained error (code 255) at io.c(601) [Receiver=3.0.7]

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and here is the sshd_config

Zitat

Protocol 2
HostKey /etc/ssh/ssh_host_rsa_key
HostKey /etc/ssh/ssh_host_dsa_key
UsePrivilegeSeparation yes
KeyRegenerationInterval 3600
ServerKeyBits 768
SyslogFacility AUTH
LogLevel INFO
LoginGraceTime 120
StrictModes yes
RSAAuthentication yes
PubkeyAuthentication yes
IgnoreRhosts yes
RhostsRSAAuthentication no
HostbasedAuthentication no
PermitEmptyPasswords no
ChallengeResponseAuthentication no
X11Forwarding yes
X11DisplayOffset 10
PrintMotd no
PrintLastLog yes
TCPKeepAlive yes
AcceptEnv LANG LC_*
Subsystem sftp /usr/lib/openssh/sftp-server
UsePAM yes
AllowGroups root ssh
AddressFamily any
Port 15223
PermitRootLogin yes
AllowTcpForwarding no
Compression no
PasswordAuthentication no
X11Forwarding no

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I changed IgnoreRhosts yes to no, and RhostsRSAAuthentication no to yes, but still no success....... anyone can help, thanks.

I checked the authorized_keys2 in the server machine (192.168.1.3) and found that it limits the host to "192.168.1.5"

Zitat

from="192.168.1.5",no-pty,no-agent-forwarding,no-port-forwarding ........

Changing the key to from="hostname" solves the problem, thanks david for your help.