Troubleshooting ssh restarting failed

A. Trouble:

Try

************************************************************

#service ssh restart

************************************************************

Result

************************************************************

Could not load host key: /etc/ssh/ssh_host_rsa_key

Could not load host key: /etc/ssh/ssh_host_dsa_key

Restarting OpenBSD Secure Shell server: sshdCould not load host key: /etc/ssh/ssh_host_rsa_key

Could not load host key: /etc/ssh/ssh_host_dsa_key

************************************************************

B. troubleshout testing:

************************************************************

#ssh-keygen -f '/etc/ssh/ssh_host_rsa_key -N' -t rsa

#ssh-keygen -f '/etc/ssh/ssh_host_dsa_key -N' -t dsa

# dpkg-reconfigure openssh-server

************************************************************

Result

************************************************************

Creating SSH2 RSA key; this may take some time ...

Restarting OpenBSD Secure Shell server: sshd.

root@debian-6:/home/debian-6/Desktop# service ssh restart

Restarting OpenBSD Secure Shell server: sshd.

************************************************************

Try

*************************************************************

ssh -vvv 127.0.0.1

*************************************************************

Result

*************************************************************

OpenSSH_5.5p1 Debian-6+squeeze2, OpenSSL 0.9.8o 01 Jun 2010

debug1: Reading configuration data /etc/ssh/ssh_config

debug1: Applying options for *

debug2: ssh_connect: needpriv 0

debug1: Connecting to 127.0.0.1 [127.0.0.1] port 22.

debug1: Connection established.

debug1: permanently_set_uid: 0/0

debug3: Not a RSA1 key file /root/.ssh/id_rsa.

debug2: key_type_from_name: unknown key type '-----BEGIN'

debug3: key_read: missing keytype

debug3: key_read: missing whitespace

debug2: key_type_from_name: unknown key type '-----END'

debug3: key_read: missing keytype

debug1: identity file /root/.ssh/id_rsa type 1

debug1: Checking blacklist file /usr/share/ssh/blacklist.RSA-2048

debug1: Checking blacklist file /etc/ssh/blacklist.RSA-2048

debug1: identity file /root/.ssh/id_rsa-cert type -1

debug1: identity file /root/.ssh/id_dsa type -1

debug1: identity file /root/.ssh/id_dsa-cert type -1

debug1: Remote protocol version 2.0, remote software version OpenSSH_5.5p1 Debian-6+squeeze2

debug1: match: OpenSSH_5.5p1 Debian-6+squeeze2 pat OpenSSH*

debug1: Enabling compatibility mode for protocol 2.0

debug1: Local version string SSH-2.0-OpenSSH_5.5p1 Debian-6+squeeze2

debug2: fd 3 setting O_NONBLOCK

debug1: SSH2_MSG_KEXINIT sent

debug1: SSH2_MSG_KEXINIT received

debug2: kex_parse_kexinit: diffie-hellman-group-exchange-sha256,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1

debug2: kex_parse_kexinit: ssh-rsa-cert-v00@openssh.com,ssh-dss-cert-v00@openssh.com,ssh-rsa,ssh-dss

debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,rijndael-cbc@lysator.liu.se

debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,umac-64@openssh.com,hmac-ripemd160,hmac-ripemd160@openssh.com,hmac-sha1-96,hmac-md5-96

debug2: kex_parse_kexinit: none,zlib@openssh.com,zlib

debug2: kex_parse_kexinit:

debug2: kex_parse_kexinit: first_kex_follows 0

debug2: kex_parse_kexinit: reserved 0

debug2: kex_parse_kexinit: diffie-hellman-group-exchange-sha256,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1

debug2: kex_parse_kexinit: ssh-rsa,ssh-dss

debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,rijndael-cbc@lysator.liu.se

debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,umac-64@openssh.com,hmac-ripemd160,hmac-ripemd160@openssh.com,hmac-sha1-96,hmac-md5-96

debug2: kex_parse_kexinit: none,zlib@openssh.com

debug2: kex_parse_kexinit:

debug2: kex_parse_kexinit: first_kex_follows 0

debug2: kex_parse_kexinit: reserved 0

debug2: mac_setup: found hmac-md5

debug1: kex: server->client aes128-ctr hmac-md5 none

debug2: mac_setup: found hmac-md5

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

debug2: dh_gen_key: priv key bits set: 124/256

debug2: bits set: 503/1024

debug1: SSH2_MSG_KEX_DH_GEX_INIT sent

debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY

debug3: check_host_in_hostfile: host 127.0.0.1 filename /root/.ssh/known_hosts

debug3: check_host_in_hostfile: host 127.0.0.1 filename /etc/ssh/ssh_known_hosts

debug3: check_host_in_hostfile: host 127.0.0.1 filename /root/.ssh/known_hosts

debug3: check_host_in_hostfile: host 127.0.0.1 filename /etc/ssh/ssh_known_hosts

debug2: no key of type 0 for host 127.0.0.1

debug3: check_host_in_hostfile: host 127.0.0.1 filename /root/.ssh/known_hosts2

debug3: check_host_in_hostfile: host 127.0.0.1 filename /etc/ssh/ssh_known_hosts2

debug3: check_host_in_hostfile: host 127.0.0.1 filename /root/.ssh/known_hosts

debug3: check_host_in_hostfile: host 127.0.0.1 filename /etc/ssh/ssh_known_hosts

debug2: no key of type 2 for host 127.0.0.1

The authenticity of host '127.0.0.1 (127.0.0.1)' can't be established.

RSA key fingerprint is 54:b9:2a:51:99:4e:58:76:67:17:a1:e2:c6:15:5f:15.

Are you sure you want to continue connecting (yes/no)? yes

Warning: Permanently added '127.0.0.1' (RSA) to the list of known hosts.

debug2: bits set: 495/1024

debug1: ssh_rsa_verify: signature correct

debug2: kex_derive_keys

debug2: set_newkeys: mode 1

debug1: SSH2_MSG_NEWKEYS sent

debug1: expecting SSH2_MSG_NEWKEYS

debug2: set_newkeys: mode 0

debug1: SSH2_MSG_NEWKEYS received

debug1: Roaming not allowed by server

debug1: SSH2_MSG_SERVICE_REQUEST sent

debug2: service_accept: ssh-userauth

debug1: SSH2_MSG_SERVICE_ACCEPT received

debug2: key: /root/.ssh/id_rsa (0x7f0228d1b530)

debug2: key: /root/.ssh/id_dsa ((nil))

debug1: Authentications that can continue: publickey,password

debug3: start over, passed a different list publickey,password

debug3: preferred gssapi-keyex,gssapi-with-mic,publickey,keyboard-interactive,password

debug3: authmethod_lookup publickey

debug3: remaining preferred: keyboard-interactive,password

debug3: authmethod_is_enabled publickey

debug1: Next authentication method: publickey

debug1: Offering public key: /root/.ssh/id_rsa

debug3: send_pubkey_test

debug2: we sent a publickey packet, wait for reply

debug1: Authentications that can continue: publickey,password

debug1: Trying private key: /root/.ssh/id_dsa

debug3: no such identity: /root/.ssh/id_dsa

debug2: we did not send a packet, disable method

debug3: authmethod_lookup password

debug3: remaining preferred: ,password

debug3: authmethod_is_enabled password

debug1: Next authentication method: password

root@127.0.0.1's password:

debug3: packet_send2: adding 64 (len 54 padlen 10 extra_pad 64)

debug2: we sent a password packet, wait for reply

debug1: Authentication succeeded (password).

debug1: channel 0: new [client-session]

debug3: ssh_session2_open: channel_new: 0

debug2: channel 0: send open

debug1: Requesting no-more-sessions@openssh.com

debug1: Entering interactive session.

debug2: callback start

debug2: client_session2_setup: id 0

debug2: channel 0: request pty-req confirm 1

debug1: Sending environment.

debug3: Ignored env SHELL

debug3: Ignored env TERM

debug3: Ignored env XDG_SESSION_COOKIE

debug3: Ignored env USER

debug3: Ignored env LS_COLORS

debug3: Ignored env SUDO_USER

debug3: Ignored env SUDO_UID

debug3: Ignored env USERNAME

debug3: Ignored env MAIL

debug3: Ignored env PATH

debug3: Ignored env PWD

debug1: Sending env LANG = en_US.UTF-8

debug2: channel 0: request env confirm 0

debug3: Ignored env SHLVL

debug3: Ignored env SUDO_COMMAND

debug3: Ignored env HOME

debug3: Ignored env LANGUAGE

debug3: Ignored env LOGNAME

debug3: Ignored env SUDO_GID

debug3: Ignored env DISPLAY

debug3: Ignored env COLORTERM

debug3: Ignored env XAUTHORITY

debug3: Ignored env _

debug2: channel 0: request shell confirm 1

debug2: fd 3 setting TCP_NODELAY

debug2: callback done

debug2: channel 0: open confirm rwindow 0 rmax 32768

debug2: channel_input_status_confirm: type 99 id 0

debug2: PTY allocation request accepted on channel 0

debug2: channel 0: rcvd adjust 2097152

debug2: channel_input_status_confirm: type 99 id 0

debug2: shell request accepted on channel 0

Linux debian-6 2.6.32-5-amd64 #1 SMP Mon Jan 16 16:22:28 UTC 2012 x86_64

The programs included with the Debian GNU/Linux system are free software;

the exact distribution terms for each program are described in the

individual files in /usr/share/doc/*/copyright.

Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent

permitted by applicable law.

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