sftp connection closed

[Ahmed_58]

Hi,
I'm new with sftp, it working for some system but not for all, the error I'm getting after entring the password ...

Request for subsystem 'sftp' failed on channel 0
Connection closed

see below for more detail please....

#sftp -vvv telegram@bat-bcdr
Connecting to bat-bcdr...
OpenSSH_4.4p1-hpn12v11, OpenSSL 0.9.7l 28 Sep 2006
HP-UX Secure Shell-A.04.40.005, HP-UX Secure Shell version
debug1: Reading configuration data /opt/ssh/etc/ssh_config
debug3: Seeding PRNG from /opt/ssh/libexec/ssh-rand-helper
debug2: ssh_connect: needpriv 0
debug1: Connecting to bat-bcdr [10.40.3.46] port 22.
debug1: Connection established.
debug1: identity file /home/cduser/.ssh/id_rsa type -1
debug1: identity file /home/cduser/.ssh/id_dsa type -1
debug1: Remote protocol version 2.0, remote software version OpenSSH_4.7p1+sftpfilecontrol-v1.2-hpn12v17
debug1: match: OpenSSH_4.7p1+sftpfilecontrol-v1.2-hpn12v17 pat OpenSSH*
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_4.4p1-hpn12v11
debug2: fd 4 setting O_NONBLOCK
debug3: RNG is ready, skipping seeding
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,ssh-dss
debug2: kex_parse_kexinit: aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,arcfour128,arcfour256,arcfour,aes192-cbc,aes256-cbc,rijndael-cbc@lysator.liu.se,aes128-ctr,aes192-ctr,aes256-ctr
debug2: kex_parse_kexinit: aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,arcfour128,arcfour256,arcfour,aes192-cbc,aes256-cbc,rijndael-cbc@lysator.liu.se,aes128-ctr,aes192-ctr,aes256-ctr
debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,hmac-ripemd160,hmac-ripemd160@openssh.com,hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,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: 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: 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-cbc,3des-cbc,blowfish-cbc,cast128-cbc,arcfour128,arcfour256,arcfour,aes192-cbc,aes256-cbc,rijndael-cbc@lysator.liu.se,aes128-ctr,aes192-ctr,aes256-ctr
debug2: kex_parse_kexinit: aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,arcfour128,arcfour256,arcfour,aes192-cbc,aes256-cbc,rijndael-cbc@lysator.liu.se,aes128-ctr,aes192-ctr,aes256-ctr
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: 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: 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_init: found hmac-md5
debug1: kex: server->client aes128-cbc hmac-md5 none
debug2: mac_init: found hmac-md5
debug1: kex: client->server aes128-cbc 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: 121/256
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: filename /home/cduser/.ssh/known_hosts
debug3: check_host_in_hostfile: match line 7
debug3: check_host_in_hostfile: filename /home/cduser/.ssh/known_hosts
debug3: check_host_in_hostfile: match line 8
debug1: Host 'bat-bcdr' is known and matches the RSA host key.
debug1: Found key in /home/cduser/.ssh/known_hosts:7
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: SSH2_MSG_SERVICE_REQUEST sent
debug2: service_accept: ssh-userauth
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug2: key: /home/cduser/.ssh/id_rsa (0)
debug2: key: /home/cduser/.ssh/id_dsa (0)
debug1: Authentications that can continue: publickey,password,keyboard-interactive
debug3: start over, passed a different list publickey,password,keyboard-interactive
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/cduser/.ssh/id_rsa
debug3: no such identity: /home/cduser/.ssh/id_rsa
debug1: Trying private key: /home/cduser/.ssh/id_dsa
debug3: no such identity: /home/cduser/.ssh/id_dsa
debug2: we did not send a packet, disable method
debug3: authmethod_lookup keyboard-interactive
debug3: remaining preferred: password
debug3: authmethod_is_enabled keyboard-interactive
debug1: Next authentication method: keyboard-interactive
debug2: userauth_kbdint
debug2: we sent a keyboard-interactive packet, wait for reply
debug2: input_userauth_info_req
debug2: input_userauth_info_req: num_prompts 1
Password:
debug3: packet_send2: adding 32 (len 20 padlen 12 extra_pad 64)
debug2: input_userauth_info_req
debug2: input_userauth_info_req: num_prompts 0
debug3: packet_send2: adding 48 (len 10 padlen 6 extra_pad 64)
debug1: Authentication succeeded (keyboard-interactive).
debug2: fd 5 setting O_NONBLOCK
debug2: fd 6 setting O_NONBLOCK
debug1: Final hpn_buffer_size = 131072
debug1: channel 0: new [client-session]
debug3: ssh_session2_open: channel_new: 0
debug2: channel 0: send open
debug1: Entering interactive session.
debug2: callback start
debug2: client_session2_setup: id 0
debug1: Sending subsystem: sftp
debug2: channel 0: request subsystem confirm 1
debug2: fd 4 setting TCP_NODELAY
debug2: callback done
debug2: channel 0: open confirm rwindow 0 rmax 32768
debug2: tcpwinsz: 32768 for connection: 4
Request for subsystem 'sftp' failed on channel 0
Connection closed

[Steven E. Protter]

Shalom,

Look at /var/adm/syslog/syslog.log on the target system.

There is something going on at that end. This is just a normal, I didn't get let in sequence, not a lot to go on here.

SEP

[Tim Nelson]

Questions:

1) is the user telegram on bat-bcdr have a erstricted account ? ( e.g. no shell, or other shell ? User must have a shell to allow sftp even if no sh or ksh then it must have /opt/ssh/utils/sftponly

2) Is there any firewalls in the path ?

[Ahmed_58]

hi,
The syslog.log display following;

May 9 08:45:58 bat-bcdr ftpd[18776]: FTP server (Revision 1.008 Version wuftpd-
2.6.1 Mon Feb 27 13:48:06 GMT 2006) ready.
May 9 08:46:00 bat-bcdr telnetd[18793]: getpid: peer died: Error 0
May 9 08:55:03 bat-bcdr sshd[18906]: Accepted keyboard-interactive/pam for tele
gram from 10.3.4.20 port 63898 ssh2

[Jeeshan]

Salam Ahmed

DId you check that the target system enable the ssh or sftp?

[Ahmed_58]

hi,
yes it shows it is running...
# ps -ef | grep ssh
root 15614 15612 1 09:06:20 pts/ta 0:00 grep ssh
root 24880 1 0 14:42:14 ? 0:00 /opt/ssh/sbin/sshd

[Jeeshan]

hi again

your syslog doesn't point anything regarding this. but i suspect there shouwld be an entry like bellow in syslog.log

error: subsystem: cannot stat /usr/local/libexec/sftp-server:
No such file or directory

and

subsystem request for sftp failed, subsystem not found

right?????

did you found anything like that?

[Jeeshan · Accepted solution]

Hi

Take a look at this link

http://brneurosci.org/linuxsetup54.html

[Ahmed_58]

Thanks all, it is workinf now.