Hi All,

I face this ssh issue only with "Openssh-client" i.e. the default ssh program that comes with LMDE(Linux Mint Debian Edition). If I access the remote host thru putty(Linux Mint Debian port) I don't face any issue. So this basically means that the remote server does not have any issues and hence the ssh client have some issues. My colleagues are however not facing any issues.

So elaborating.... my ssh session to many hosts(which are there in the same network) gets automatically "Killed" after some random amount of time(which is say around 1-2 minutes or less). The session abruptly ends and prints "Killed" as the output.

FYI
#ssh -V
OpenSSH_5.9p1 Debian-3, OpenSSL 1.0.0h 12 Mar 2012

Any pointer towards resolving this friends?

\m/

try ssh -v to see more info

Try adding to the /etc/ssh/sshd_config file on your server:

Please find a verbose dump of my ssh session below. This time I got kicked out in 10 seconds approx. Notice the sudden "Killed" word at last.

========================
the_user@computer ~ $ ssh -vvv root@lpc2
OpenSSH_5.9p1 Debian-3, OpenSSL 1.0.0h 12 Mar 2012
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 19: Applying options for *
debug2: ssh_connect: needpriv 0
debug1: Connecting to lpc2 [172.16.1.2] port 22.
debug1: Connection established.
debug3: Incorrect RSA1 identifier
debug3: Could not load "/home/the_user/.ssh/id_rsa" as a RSA1 public key
debug1: identity file /home/the_user/.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 /home/the_user/.ssh/id_rsa-cert type -1
debug1: identity file /home/the_user/.ssh/id_dsa type -1
debug1: identity file /home/the_user/.ssh/id_dsa-cert type -1
debug1: identity file /home/the_user/.ssh/id_ecdsa type -1
debug1: identity file /home/the_user/.ssh/id_ecdsa-cert type -1
debug1: Remote protocol version 1.99, remote software version OpenSSH_3.9p1
debug1: match: OpenSSH_3.9p1 pat OpenSSH_3.*
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_5.9p1 Debian-3
debug2: fd 3 setting O_NONBLOCK
debug3: load_hostkeys: loading entries for host "lpc2" from file "/home/the_user/.ssh/known_hosts"
debug3: load_hostkeys: found key type RSA in file /home/the_user/.ssh/known_hosts:16
debug3: load_hostkeys: loaded 1 keys
debug3: order_hostkeyalgs: prefer hostkeyalgs: ssh-rsa-cert-v01@openssh.com,ssh-rsa...00@openssh.com,ssh-rsa
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: ssh-rsa-cert-v01@openssh.com,ssh-rsa...00@openssh.com,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,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: 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-sha2-256,hmac-sha2-256-96,hmac-sha2-512,hmac-sha2-512-96,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-sha2-256,hmac-sha2-256-96,hmac-sha2-512,hmac-sha2-512-96,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-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,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,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
debug2: kex_parse_kexinit: none,zlib
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
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: 127/256
debug2: bits set: 512/1024
debug1: SSH2_MSG_KEX_DH_GEX_INIT sent
debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY
debug1: Server host key: RSA 2b:4c:be:e8:13:6b:6a:08:95:34:16:46:aa:2b:36:89
debug3: load_hostkeys: loading entries for host "lpc2" from file "/home/the_user/.ssh/known_hosts"
debug3: load_hostkeys: found key type RSA in file /home/the_user/.ssh/known_hosts:16
debug3: load_hostkeys: loaded 1 keys
debug3: load_hostkeys: loading entries for host "172.16.1.2" from file "/home/the_user/.ssh/known_hosts"
debug3: load_hostkeys: found key type RSA in file /home/the_user/.ssh/known_hosts:17
debug3: load_hostkeys: loaded 1 keys
debug1: Host 'lpc2' is known and matches the RSA host key.
debug1: Found key in /home/the_user/.ssh/known_hosts:16
debug2: bits set: 516/1024
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: /home/the_user/.ssh/id_rsa (0x7f803e0a7050)
debug2: key: /home/the_user/.ssh/id_dsa ((nil))
debug2: key: /home/the_user/.ssh/id_ecdsa ((nil))
debug1: Authentications that can continue: publickey,gssapi-with-mic,password
debug3: start over, passed a different list publickey,gssapi-with-mic,password
debug3: preferred gssapi-keyex,gssapi-with-mic,publickey,keyboard-interactive,password
debug3: authmethod_lookup gssapi-with-mic
debug3: remaining preferred: publickey,keyboard-interactive,password
debug3: authmethod_is_enabled gssapi-with-mic
debug1: Next authentication method: gssapi-with-mic
debug1: Unspecified GSS failure. Minor code may provide more information
Credentials cache file '/tmp/krb5cc_1000' not found

debug1: Unspecified GSS failure. Minor code may provide more information
Credentials cache file '/tmp/krb5cc_1000' not found

debug1: Unspecified GSS failure. Minor code may provide more information


debug1: Unspecified GSS failure. Minor code may provide more information
Credentials cache file '/tmp/krb5cc_1000' not found

debug2: we did not send a packet, disable method
debug3: authmethod_lookup publickey
debug3: remaining preferred: keyboard-interactive,password
debug3: authmethod_is_enabled publickey
debug1: Next authentication method: publickey
debug1: Offering RSA public key: /home/the_user/.ssh/id_rsa
debug3: send_pubkey_test
debug2: we sent a publickey packet, wait for reply
debug1: Server accepts key: pkalg ssh-rsa blen 279
debug2: input_userauth_pk_ok: fp 68:5d:8c:84:5e:23:ef:d6:52:b3:77:c9:24:fe:27:68
debug3: sign_and_send_pubkey: RSA 68:5d:8c:84:5e:23:ef:d6:52:b3:77:c9:24:fe:27:68
debug1: Authentication succeeded (publickey).
Authenticated to lpc2 ([172.16.1.2]:22).
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
debug2: fd 3 setting TCP_NODELAY
debug2: channel 0: request pty-req confirm 1
debug1: Sending environment.
debug3: Ignored env SSH_AGENT_PID
debug3: Ignored env GPG_AGENT_INFO
debug3: Ignored env SHELL
debug3: Ignored env TERM
debug3: Ignored env XDG_SESSION_COOKIE
debug3: Ignored env GJS_DEBUG_OUTPUT
debug3: Ignored env WINDOWID
debug3: Ignored env OLDPWD
debug3: Ignored env GNOME_KEYRING_CONTROL
debug3: Ignored env GJS_DEBUG_TOPICS
debug3: Ignored env USER
debug3: Ignored env SSH_AUTH_SOCK
debug3: Ignored env USERNAME
debug3: Ignored env SESSION_MANAGER
debug3: Ignored env PATH
debug3: Ignored env DESKTOP_SESSION
debug3: Ignored env PWD
debug3: Ignored env GNOME_KEYRING_PID
debug1: Sending env LANG = en_IN.UTF-8
debug2: channel 0: request env confirm 0
debug3: Ignored env MDM_XSERVER_LOCATION
debug3: Ignored env SHLVL
debug3: Ignored env HOME
debug3: Ignored env GNOME_DESKTOP_SESSION_ID
debug3: Ignored env LOGNAME
debug3: Ignored env XDG_DATA_DIRS
debug3: Ignored env DBUS_SESSION_BUS_ADDRESS
debug3: Ignored env MDMSESSION
debug3: Ignored env WINDOWPATH
debug3: Ignored env DISPLAY
debug3: Ignored env MDM_LANG
debug3: Ignored env XAUTHORITY
debug3: Ignored env COLORTERM
debug3: Ignored env _
debug2: channel 0: request shell confirm 1
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 131072
debug2: channel_input_status_confirm: type 99 id 0
debug2: shell request accepted on channel 0
Last login: Wed May 23 10:27:01 2012 from computer.intranet.the_domain.ac.in
[root@lpc2 ~]# echo blahblahblah
blahblahblah
[root@lpc2 ~]# echo blahblahblah
blahblahblah
[root@lpc2 ~]# echo blahblahblah
blahblahblah
[root@lpc2 ~]# echo blahblahblah
blahblahblah
[root@lpc2 ~]# Killed
the_user@computer ~ $
==========

Oh... I forgot to add that the suggested settings by "jv2112" were already there.