Dears,

Recently the server I'm working on was re installed and now I am having a problem with the sftp.

Here is the verbose output of sftp

bash-4.2$ sftp -vvv www.xxxxxxxxx.com
OpenSSH_6.3, OpenSSL 1.0.1e 11 Feb 2013
debug1: Reading configuration data /etc/ssh/ssh_config
debug2: ssh_connect: needpriv 0
debug1: Connecting to www.xxxxxxxxx.com [55.66.88.77] port 22.
debug1: Connection established.
debug1: identity file /home/bobi/.ssh/id_rsa type -1
debug1: identity file /home/bobi/.ssh/id_rsa-cert type -1
debug1: identity file /home/bobi/.ssh/id_dsa type -1
debug1: identity file /home/bobi/.ssh/id_dsa-cert type -1
debug1: identity file /home/bobi/.ssh/id_ecdsa type -1
debug1: identity file /home/bobi/.ssh/id_ecdsa-cert type -1
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_6.3
debug1: Remote protocol version 2.0, remote software version OpenSSH_6.6p1 Ubuntu-2ubuntu1
debug1: match: OpenSSH_6.6p1 Ubuntu-2ubuntu1 pat OpenSSH*
debug2: fd 3 setting O_NONBLOCK
debug3: load_hostkeys: loading entries for host "www.xxxxxxxxx.com" from file "/home/bobi/.ssh/known_hosts"
debug3: load_hostkeys: found key type ECDSA in file /home/bobi/.ssh/known_hosts:1
debug3: load_hostkeys: loaded 1 keys
debug3: order_hostkeyalgs: prefer hostkeyalgs: ecdsa-sha2-nistp256-cert-v01@openssh...01@openssh.com,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug2: kex_parse_kexinit: ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1
debug2: kex_parse_kexinit: ecdsa-sha2-nistp256-cert-v01@openssh...00@openssh.com,ssh-rsa,ssh-dss
debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-gcm@openssh.com,aes256-gcm@openssh.com,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,rijndael-cbc@lysator.liu.se
debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-gcm@openssh.com,aes256-gcm@openssh.com,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,rijndael-cbc@lysator.liu.se
debug2: kex_parse_kexinit: hmac-md5-etm@openssh.com,hmac-sha1-e...60@openssh.com,hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: hmac-md5-etm@openssh.com,hmac-sha1-e...60@openssh.com,hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: none,zlib@openssh.com,zlib
debug2: kex_parse_kexinit: none,zlib@openssh.com,zlib
debug2: kex_parse_kexinit:
debug2: kex_parse_kexinit:
debug2: kex_parse_kexinit: first_kex_follows 0
debug2: kex_parse_kexinit: reserved 0
debug2: kex_parse_kexinit: curve25519-sha256@libssh.org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,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,ecdsa-sha2-nistp256
debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-gcm@openssh.com,aes256-gcm@openssh.com,chacha20-poly1305@openssh.com,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,rijndael-cbc@lysator.liu.se
debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-gcm@openssh.com,aes256-gcm@openssh.com,chacha20-poly1305@openssh.com,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,rijndael-cbc@lysator.liu.se
debug2: kex_parse_kexinit: hmac-md5-etm@openssh.com,hmac-sha1-e...60@openssh.com,hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: hmac-md5-etm@openssh.com,hmac-sha1-e...60@openssh.com,hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: none,zlib@openssh.com
debug2: kex_parse_kexinit: none,zlib@openssh.com
debug2: kex_parse_kexinit:
debug2: kex_parse_kexinit:
debug2: kex_parse_kexinit: first_kex_follows 0
debug2: kex_parse_kexinit: reserved 0
debug2: mac_setup: found hmac-md5-etm@openssh.com
debug1: kex: server->client aes128-ctr hmac-md5-etm@openssh.com none
debug2: mac_setup: found hmac-md5-etm@openssh.com
debug1: kex: client->server aes128-ctr hmac-md5-etm@openssh.com none
debug1: sending SSH2_MSG_KEX_ECDH_INIT
debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
debug1: Server host key: ECDSA b2:73:fc:ef:33:52:bb:de:1c:fe:56:bb:65:b3:c3:7b
debug3: load_hostkeys: loading entries for host "www.xxxxxxxxx.com" from file "/home/bobi/.ssh/known_hosts"
debug3: load_hostkeys: found key type ECDSA in file /home/bobi/.ssh/known_hosts:1
debug3: load_hostkeys: loaded 1 keys
debug3: load_hostkeys: loading entries for host "55.66.88.77" from file "/home/bobi/.ssh/known_hosts"
debug3: load_hostkeys: found key type ECDSA in file /home/bobi/.ssh/known_hosts:1
debug3: load_hostkeys: loaded 1 keys
debug1: Host 'www.xxxxxxxxx.com' is known and matches the ECDSA host key.
debug1: Found key in /home/bobi/.ssh/known_hosts:1
debug1: ssh_ecdsa_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: /home/bobi/.ssh/id_rsa ((nil)),
debug2: key: /home/bobi/.ssh/id_dsa ((nil)),
debug2: key: /home/bobi/.ssh/id_ecdsa ((nil)),
debug1: Authentications that can continue: publickey
debug3: start over, passed a different list publickey
debug3: preferred 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: Trying private key: /home/bobi/.ssh/id_rsa
debug3: no such identity: /home/bobi/.ssh/id_rsa: No such file or directory
debug1: Trying private key: /home/bobi/.ssh/id_dsa
debug3: no such identity: /home/bobi/.ssh/id_dsa: No such file or directory
debug1: Trying private key: /home/bobi/.ssh/id_ecdsa
debug3: no such identity: /home/bobi/.ssh/id_ecdsa: No such file or directory
debug2: we did not send a packet, disable method
debug1: No more authentication methods to try.
Permission denied (publickey).
Couldn't read packet: Connection reset by peer

the servers public key has probably been changed. you probably need to get a new key made for the client.

you probably need to delete the first line of this file:
/home/bobi/.ssh/known_hosts

so that the server will prompt you for a password.

Thanks for the reply schneidz,

Here is the output after deleting the known_hosts file

bash-4.2$ sftp -vvv www.xxxxxxxx.com
OpenSSH_6.3, OpenSSL 1.0.1e 11 Feb 2013
debug1: Reading configuration data /etc/ssh/ssh_config
debug2: ssh_connect: needpriv 0
debug1: Connecting to www.xxxxxxxx.com [55.66.77.88] port 22.
debug1: Connection established.
debug1: identity file /home/bobi/.ssh/id_rsa type -1
debug1: identity file /home/bobi/.ssh/id_rsa-cert type -1
debug1: identity file /home/bobi/.ssh/id_dsa type -1
debug1: identity file /home/bobi/.ssh/id_dsa-cert type -1
debug1: identity file /home/bobi/.ssh/id_ecdsa type -1
debug1: identity file /home/bobi/.ssh/id_ecdsa-cert type -1
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_6.3
debug1: Remote protocol version 2.0, remote software version OpenSSH_6.6p1 Ubuntu-2ubuntu1
debug1: match: OpenSSH_6.6p1 Ubuntu-2ubuntu1 pat OpenSSH*
debug2: fd 3 setting O_NONBLOCK
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug2: kex_parse_kexinit: ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1
debug2: kex_parse_kexinit: ecdsa-sha2-nistp256-cert-v01@openssh...00@openssh.com,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,ssh-rsa,ssh-dss
debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-gcm@openssh.com,aes256-gcm@openssh.com,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,rijndael-cbc@lysator.liu.se
debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-gcm@openssh.com,aes256-gcm@openssh.com,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,rijndael-cbc@lysator.liu.se
debug2: kex_parse_kexinit: hmac-md5-etm@openssh.com,hmac-sha1-e...60@openssh.com,hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: hmac-md5-etm@openssh.com,hmac-sha1-e...60@openssh.com,hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: none,zlib@openssh.com,zlib
debug2: kex_parse_kexinit: none,zlib@openssh.com,zlib
debug2: kex_parse_kexinit:
debug2: kex_parse_kexinit:
debug2: kex_parse_kexinit: first_kex_follows 0
debug2: kex_parse_kexinit: reserved 0
debug2: kex_parse_kexinit: curve25519-sha256@libssh.org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,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,ecdsa-sha2-nistp256
debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-gcm@openssh.com,aes256-gcm@openssh.com,chacha20-poly1305@openssh.com,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,rijndael-cbc@lysator.liu.se
debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-gcm@openssh.com,aes256-gcm@openssh.com,chacha20-poly1305@openssh.com,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,rijndael-cbc@lysator.liu.se
debug2: kex_parse_kexinit: hmac-md5-etm@openssh.com,hmac-sha1-e...60@openssh.com,hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: hmac-md5-etm@openssh.com,hmac-sha1-e...60@openssh.com,hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: none,zlib@openssh.com
debug2: kex_parse_kexinit: none,zlib@openssh.com
debug2: kex_parse_kexinit:
debug2: kex_parse_kexinit:
debug2: kex_parse_kexinit: first_kex_follows 0
debug2: kex_parse_kexinit: reserved 0
debug2: mac_setup: found hmac-md5-etm@openssh.com
debug1: kex: server->client aes128-ctr hmac-md5-etm@openssh.com none
debug2: mac_setup: found hmac-md5-etm@openssh.com
debug1: kex: client->server aes128-ctr hmac-md5-etm@openssh.com none
debug1: sending SSH2_MSG_KEX_ECDH_INIT
debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
debug1: Server host key: ECDSA b2:73:fc:ef:33:52:bb:de:1c:fe:56:bb:65:b3:c3:7b
The authenticity of host 'www.xxxxxxxx.com (55.66.77.88)' can't be established.
ECDSA key fingerprint is b2:73:fc:ef:33:52:bb:de:1c:fe:56:bb:65:b3:c3:7b.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added 'www.xxxxxxxx.com,55.66.77.88' (ECDSA) to the list of known hosts.
debug1: ssh_ecdsa_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: /home/bobi/.ssh/id_rsa ((nil)),
debug2: key: /home/bobi/.ssh/id_dsa ((nil)),
debug2: key: /home/bobi/.ssh/id_ecdsa ((nil)),
debug1: Authentications that can continue: publickey
debug3: start over, passed a different list publickey
debug3: preferred 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: Trying private key: /home/bobi/.ssh/id_rsa
debug3: no such identity: /home/bobi/.ssh/id_rsa: No such file or directory
debug1: Trying private key: /home/bobi/.ssh/id_dsa
debug3: no such identity: /home/bobi/.ssh/id_dsa: No such file or directory
debug1: Trying private key: /home/bobi/.ssh/id_ecdsa
debug3: no such identity: /home/bobi/.ssh/id_ecdsa: No such file or directory
debug2: we did not send a packet, disable method
debug1: No more authentication methods to try.
Permission denied (publickey).
Couldn't read packet: Connection reset by peer
bash-4.2$

Are you able to restart ssh daemon on server?

Can you check ~/.ssh/file permissions on the server?

For correct directory and file permissions.
https://kimmo.suominen.com/docs/ssh/

It is not possible to restart the daemon or check permissions because I have only sftp access for this server.

By the way on windows I can connect without any problem using FileZilla. All I do is set up the key file and user name.

Here is the filezilla output

Status: Connecting to www.xxxxxxxxxxx.com...
Response: fzSftp started
Command: keyfile "C:\Users\zzzzzzz\Downloads\webconsumption.ppk"
Command: open "yyyyyyyyyyy@www.xxxxxxxxxxx.com" 22
Command: Trust changed Hostkey: Once
Status: Connected to xxxxxxxxxxx.com
Status: Retrieving directory listing...
Command: pwd
Response: Current directory is: "/home/ubuntu"
Command: ls
Status: Listing directory /home/ubuntu
Status: Calculating timezone offset of server...
Command: mtime ".profile"
Response: 1397005395
Status: Timezone offsets: Server: 0 seconds. Local: 7200 seconds. Difference: 7200 seconds.
Status: Directory listing successful

Have you verified the key on the client? Does it have the proper permissions?

Thanks for the replies,

Finally I managed to connect from terminal using using hard coded identity file

sftp -v -o IdentityFile=/home/bobi/.ssh/id_rsa yyyy@xxxx.com
OpenSSH_6.3, OpenSSL 1.0.1e 11 Feb 2013
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: Connecting to xxxx.com [54.72.88.206] port 22.
debug1: Connection established.
debug1: permanently_set_uid: 0/0
debug1: identity file /home/bobi/.ssh/id_rsa type 1
debug1: identity file /home/bobi/.ssh/id_rsa-cert type -1
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_6.3
debug1: Remote protocol version 2.0, remote software version OpenSSH_6.6p1 Ubuntu-2ubuntu1
debug1: match: OpenSSH_6.6p1 Ubuntu-2ubuntu1 pat OpenSSH*
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug1: kex: server->client aes128-ctr hmac-md5-etm@openssh.com none
debug1: kex: client->server aes128-ctr hmac-md5-etm@openssh.com none
debug1: sending SSH2_MSG_KEX_ECDH_INIT
debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
debug1: Server host key: ECDSA b2:73:fc:ef:33:52:bb:de:1c:fe:56:bb:65:b3:c3:7b
debug1: Host 'xxxx.com' is known and matches the ECDSA host key.
debug1: Found key in /root/.ssh/known_hosts:1
debug1: ssh_ecdsa_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: Offering RSA public key: /home/bobi/.ssh/id_rsa
debug1: Server accepts key: pkalg ssh-rsa blen 279
debug1: read PEM private key done: type RSA
debug1: Authentication succeeded (publickey).
Authenticated to xxxx.com ([54.72.88.206]:22).
debug1: channel 0: new [client-session]
debug1: Requesting no-more-sessions@openssh.com
debug1: Entering interactive session.
debug1: Sending subsystem: sftp
Connected to xxxx.com.

But Konqueror still rejects with "Could Not Login: Authentication failed."

I guess the reason is that it doesn't look at the right IdentityFile, so do you know where can I find the sftp config file?

I tried creating ~/.ssh/config file with content

Host xxxx.com
IdentityFile /home/bobi/.ssh/id_rsa

But it sill doesn't work, is there any other config file Konqueror looks for?

michaelk, you were right, permissions were not correct for both the config and the key file.
I changed those and now it works fine.

Thanks a lot !

Well done. You can mark the thread as solved via the the thread tools menu at the top of the page.