ssh login stuck at "expecting SSH2_MSG_KEX_ECDH_REPLY"
Hariharasubramanian Ramasubramanian
hramasub at in.ibm.com
Mon Oct 23 19:12:11 AWST 2017
ssh login gets stuck at "expecting SSH2_MSG_KEX_ECDH_REPLY" at random.
However forcing ssh to use 3des cipher suite makes the login go through.
What causes the login to succeed when cipher suite is forced but fail
otherwise ?
Here are the debug for 3 different use cases:
1) successful login attempt
2) failed login attempt
3) forced 3des cipher suite
==============================================================================
1) Successful login attempt
==============================================================================
-bash-4.1$ ssh -vvv root at wsbmc011
OpenSSH_5.8p2, OpenSSL 1.0.0g 18 Jan 2012
debug1: Reading configuration
data /gsa/ausgsa/projects/i/indiateam04/hramasub/.ssh/config
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: Applying options for *
debug2: ssh_connect: needpriv 0
debug1: Connecting to wsbmc011 [9.3.21.42] port 22.
debug1: Connection established.
debug3: Incorrect RSA1 identifier
debug3: Could not load
"/gsa/ausgsa/projects/i/indiateam04/hramasub/.ssh/id_rsa" as a RSA1 public
key
debug2: key_type_from_name: unknown key type '-----BEGIN'
debug3: key_read: missing keytype
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug2: key_type_from_name: unknown key type '-----END'
debug3: key_read: missing keytype
debug1: identity
file /gsa/ausgsa/projects/i/indiateam04/hramasub/.ssh/id_rsa type 1
debug1: identity
file /gsa/ausgsa/projects/i/indiateam04/hramasub/.ssh/id_rsa-cert type -1
debug1: identity
file /gsa/ausgsa/projects/i/indiateam04/hramasub/.ssh/id_dsa type -1
debug1: identity
file /gsa/ausgsa/projects/i/indiateam04/hramasub/.ssh/id_dsa-cert type -1
debug1: identity
file /gsa/ausgsa/projects/i/indiateam04/hramasub/.ssh/id_ecdsa type -1
debug1: identity
file /gsa/ausgsa/projects/i/indiateam04/hramasub/.ssh/id_ecdsa-cert type -1
debug1: Remote protocol version 2.0, remote software version
dropbear_2016.74
debug1: no match: dropbear_2016.74
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_5.8
debug2: fd 3 setting O_NONBLOCK
debug3: load_hostkeys: loading entries for host "wsbmc011" from file
"/gsa/ausgsa/projects/i/indiateam04/hramasub/.ssh/known_hosts"
debug3: load_hostkeys: found key type RSA in
file /gsa/ausgsa/projects/i/indiateam04/hramasub/.ssh/known_hosts:23
debug3: load_hostkeys: loaded 1 keys
debug3: order_hostkeyalgs: prefer hostkeyalgs:
ssh-rsa-cert-v01 at openssh.com,ssh-rsa-cert-v00 at 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 at openssh.com,ssh-rsa-cert-v00 at openssh.com,ssh-rsa,ecdsa-sha2-nistp256-cert-v01 at openssh.com,ecdsa-sha2-nistp384-cert-v01 at openssh.com,ecdsa-sha2-nistp521-cert-v01 at openssh.com,ssh-dss-cert-v01 at openssh .com,ssh-dss-cert-v00 at 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 at 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 at lysator.liu.se
debug2: kex_parse_kexinit:
hmac-md5,hmac-sha1,umac-64 at openssh.com,hmac-ripemd160,hmac-ripemd160 at openssh.com,hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit:
hmac-md5,hmac-sha1,umac-64 at openssh.com,hmac-ripemd160,hmac-ripemd160 at openssh.com,hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: none,zlib at openssh.com,zlib
debug2: kex_parse_kexinit: none,zlib at 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 at libssh.org,ecdh-sha2-nistp521,ecdh-sha2-nistp384,ecdh-sha2-nistp256,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1,kexguess2 at matt.ucc.asn.au
debug2: kex_parse_kexinit: ssh-rsa
debug2: kex_parse_kexinit:
aes128-ctr,aes256-ctr,aes128-cbc,aes256-cbc,twofish256-cbc,twofish-cbc,twofish128-cbc,3des-ctr,3des-cbc
debug2: kex_parse_kexinit:
aes128-ctr,aes256-ctr,aes128-cbc,aes256-cbc,twofish256-cbc,twofish-cbc,twofish128-cbc,3des-ctr,3des-cbc
debug2: kex_parse_kexinit:
hmac-sha1-96,hmac-sha1,hmac-sha2-256,hmac-sha2-512,hmac-md5
debug2: kex_parse_kexinit:
hmac-sha1-96,hmac-sha1,hmac-sha2-256,hmac-sha2-512,hmac-md5
debug2: kex_parse_kexinit: zlib at openssh.com,none
debug2: kex_parse_kexinit: zlib at openssh.com,none
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: sending SSH2_MSG_KEX_ECDH_INIT
debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
debug1: Server host key: RSA
70:28:98:8f:c1:8b:0e:33:a2:cc:e5:3d:c3:d0:f3:82
debug3: load_hostkeys: loading entries for host "wsbmc011" from file
"/gsa/ausgsa/projects/i/indiateam04/hramasub/.ssh/known_hosts"
debug3: load_hostkeys: found key type RSA in
file /gsa/ausgsa/projects/i/indiateam04/hramasub/.ssh/known_hosts:23
debug3: load_hostkeys: loaded 1 keys
debug3: load_hostkeys: loading entries for host "9.3.21.42" from file
"/gsa/ausgsa/projects/i/indiateam04/hramasub/.ssh/known_hosts"
debug3: load_hostkeys: found key type RSA in
file /gsa/ausgsa/projects/i/indiateam04/hramasub/.ssh/known_hosts:15
debug3: load_hostkeys: loaded 1 keys
debug1: Host 'wsbmc011' is known and matches the RSA host key.
debug1: Found key
in /gsa/ausgsa/projects/i/indiateam04/hramasub/.ssh/known_hosts:23
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: /gsa/ausgsa/projects/i/indiateam04/hramasub/.ssh/id_rsa
(0x9dd410)
debug2: key: /gsa/ausgsa/projects/i/indiateam04/hramasub/.ssh/id_dsa
((nil))
debug2: key: /gsa/ausgsa/projects/i/indiateam04/hramasub/.ssh/id_ecdsa
((nil))
debug1: Authentications that can continue: publickey,password
debug3: start over, passed a different list publickey,password
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: Offering RSA public
key: /gsa/ausgsa/projects/i/indiateam04/hramasub/.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: /gsa/ausgsa/projects/i/indiateam04/hramasub/.ssh/id_dsa
debug3: no such
identity: /gsa/ausgsa/projects/i/indiateam04/hramasub/.ssh/id_dsa
debug1: Trying private
key: /gsa/ausgsa/projects/i/indiateam04/hramasub/.ssh/id_ecdsa
debug3: no such
identity: /gsa/ausgsa/projects/i/indiateam04/hramasub/.ssh/id_ecdsa
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 at wsbmc011's password:
==============================================================================
2) failed login attempt
==============================================================================
$ ssh -v root at wsbmc011
OpenSSH_5.8p2, OpenSSL 1.0.0g 18 Jan 2012
debug1: Reading configuration
data /gsa/ausgsa/projects/i/indiateam04/gkeishin/.ssh/config
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: Applying options for *
debug1: Connecting to wsbmc011 [9.3.21.42] port 22.
debug1: Connection established.
debug1: identity
file /gsa/ausgsa/projects/i/indiateam04/gkeishin/.ssh/id_rsa type 1
debug1: identity
file /gsa/ausgsa/projects/i/indiateam04/gkeishin/.ssh/id_rsa-cert type -1
debug1: identity
file /gsa/ausgsa/projects/i/indiateam04/gkeishin/.ssh/id_dsa type -1
debug1: identity
file /gsa/ausgsa/projects/i/indiateam04/gkeishin/.ssh/id_dsa-cert type -1
debug1: identity
file /gsa/ausgsa/projects/i/indiateam04/gkeishin/.ssh/id_ecdsa type -1
debug1: identity
file /gsa/ausgsa/projects/i/indiateam04/gkeishin/.ssh/id_ecdsa-cert type -1
debug1: Remote protocol version 2.0, remote software version
dropbear_2016.74
debug1: no match: dropbear_2016.74
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_5.8
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: sending SSH2_MSG_KEX_ECDH_INIT
debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
==============================================================================
3) forced 3des cipher suite
==============================================================================
$ ssh -c 3des -v root at wsbmc011
OpenSSH_5.8p2, OpenSSL 1.0.0g 18 Jan 2012
debug1: Reading configuration
data /gsa/ausgsa/projects/i/indiateam04/gkeishin/.ssh/config
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: Applying options for *
debug1: Connecting to wsbmc011 [9.3.21.42] port 22.
debug1: Connection established.
debug1: identity
file /gsa/ausgsa/projects/i/indiateam04/gkeishin/.ssh/id_rsa type 1
debug1: identity
file /gsa/ausgsa/projects/i/indiateam04/gkeishin/.ssh/id_rsa-cert type -1
debug1: identity
file /gsa/ausgsa/projects/i/indiateam04/gkeishin/.ssh/id_dsa type -1
debug1: identity
file /gsa/ausgsa/projects/i/indiateam04/gkeishin/.ssh/id_dsa-cert type -1
debug1: identity
file /gsa/ausgsa/projects/i/indiateam04/gkeishin/.ssh/id_ecdsa type -1
debug1: identity
file /gsa/ausgsa/projects/i/indiateam04/gkeishin/.ssh/id_ecdsa-cert type -1
debug1: Remote protocol version 2.0, remote software version
dropbear_2016.74
debug1: no match: dropbear_2016.74
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_5.8
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug1: kex: server->client 3des-cbc hmac-md5 none
debug1: kex: client->server 3des-cbc hmac-md5 none
debug1: sending SSH2_MSG_KEX_ECDH_INIT
debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
debug1: Server host key: RSA
70:28:98:8f:c1:8b:0e:33:a2:cc:e5:3d:c3:d0:f3:82
debug1: Host 'wsbmc011' is known and matches the RSA host key.
debug1: Found key
in /gsa/ausgsa/projects/i/indiateam04/gkeishin/.ssh/known_hosts:26
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,password
debug1: Next authentication method: publickey
debug1: Offering RSA public
key: /gsa/ausgsa/projects/i/indiateam04/gkeishin/.ssh/id_rsa
debug1: Authentications that can continue: publickey,password
debug1: Trying private
key: /gsa/ausgsa/projects/i/indiateam04/gkeishin/.ssh/id_dsa
debug1: Trying private
key: /gsa/ausgsa/projects/i/indiateam04/gkeishin/.ssh/id_ecdsa
debug1: Next authentication method: password
root at wsbmc011's password:
Thanks in advance,
Hari !
Hariharasubramanian R.
Power Firmware Development
IBM India Systems & Technology Lab, Bangalore, India
Phone: +91 80 4025 6950
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