title: Paramiko - Bad Authentication Type [Cisco SG-300 Switch]
body: <p>I use the configuration script over the ssh on the following link.The Script is not important, the important thing is that importing parmaiko module. But I added a link:</p>
  <p><a href="https://github.com/enessanal/NetConfPy/blob/master/netconf.py" rel="nofollow noreferrer">https://github.com/enessanal/NetConfPy/blob/master/netconf.py</a></p>
  <p>And related piece of code:</p>
  <pre><code>import paramiko
  ssh = paramiko.SSHClient()
  ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
  try:
      ssh.connect(hostname=host,port=port,username=username,password=password,timeout=timeout)
  except Exception as exception:
      print(str(exception))
  </code></pre>
  <p>The script run successfully all linux devices including old model HP switches except one device, Cisco SG-300 Switch. I think I understand the problem. The problem is about the Switch.
  This type of switches behave differently. When trying a normal ssh connection with ssh command or through Putty, two authentication mechanisms occur. First one is &quot;Login as&quot; and the other one is &quot;username&quot;. We interested in the second one. But the program (paramiko client) can not bypass &quot;login as&quot; part. And throw &quot;Bad authentication type&quot; Exception for every time.
  How can I solve this problem? Or is there another method for automate configurations through ssh connection?</p>
  <p>Debugging info:</p>
  <pre><code>OpenSSH_7.9p1 Debian-1, OpenSSL 1.1.1  11 Sep 2018
  
  debug1: Reading configuration data /etc/ssh/ssh_config
  debug1: /etc/ssh/ssh_config line 19: Applying options for *
  debug2: resolve_canonicalize: hostname 10.39.31.11 is address
  debug2: ssh_connect_direct
  debug1: Connecting to 10.39.31.11 [10.39.31.11] port 22.
  debug1: Connection established.
  debug1: identity file /root/.ssh/id_rsa type -1
  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: identity file /root/.ssh/id_ecdsa type -1
  debug1: identity file /root/.ssh/id_ecdsa-cert type -1
  debug1: identity file /root/.ssh/id_ed25519 type -1
  debug1: identity file /root/.ssh/id_ed25519-cert type -1
  debug1: identity file /root/.ssh/id_xmss type -1
  debug1: identity file /root/.ssh/id_xmss-cert type -1
  debug1: Local version string SSH-2.0-OpenSSH_7.9p1 Debian-1
  debug1: Remote protocol version 2.0, remote software version OpenSSH_7.3p1.RL
  debug1: match: OpenSSH_7.3p1.RL pat OpenSSH_7.0*,OpenSSH_7.1*,OpenSSH_7.2*,OpenSSH_7.3*,OpenSSH_7.4*,OpenSSH_7.5*,OpenSSH_7.6*,OpenSSH_7.7* compat 0x04000002
  debug2: fd 5 setting O_NONBLOCK
  debug1: Authenticating to 10.39.31.11:22 as 'root'
  debug3: hostkeys_foreach: reading file &quot;/root/.ssh/known_hosts&quot;
  debug3: record_hostkey: found key type RSA in file /root/.ssh/known_hosts:9
  debug3: load_hostkeys: loaded 1 keys from 10.39.31.11
  debug3: order_hostkeyalgs: prefer hostkeyalgs: rsa-sha2-512-cert-v01@openssh.com,rsa-sha2-256-cert-v01@openssh.com,ssh-rsa-cert-v01@openssh.com,rsa-sha2-512,rsa-sha2-256,ssh-rsa
  debug3: send packet: type 20
  debug1: SSH2_MSG_KEXINIT sent
  debug3: receive packet: type 20
  debug1: SSH2_MSG_KEXINIT received
  debug2: local client KEXINIT proposal
  debug2: KEX algorithms: curve25519-sha256,curve25519-sha256@libssh.org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,diffie-hellman-group14-sha256,diffie-hellman-group14-sha1,ext-info-c
  debug2: host key algorithms: rsa-sha2-512-cert-v01@openssh.com,rsa-sha2-256-cert-v01@openssh.com,ssh-rsa-cert-v01@openssh.com,rsa-sha2-512,rsa-sha2-256,ssh-rsa,ecdsa-sha2-nistp256-cert-v01@openssh.com,ecdsa-sha2-nistp384-cert-v01@openssh.com,ecdsa-sha2-nistp521-cert-v01@openssh.com,ssh-ed25519-cert-v01@openssh.com,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,ssh-ed25519
  debug2: ciphers ctos: chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com
  debug2: ciphers stoc: chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com
  debug2: MACs ctos: umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1
  debug2: MACs stoc: umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1
  debug2: compression ctos: none,zlib@openssh.com,zlib
  debug2: compression stoc: none,zlib@openssh.com,zlib
  debug2: languages ctos: 
  debug2: languages stoc: 
  debug2: first_kex_follows 0 
  debug2: reserved 0 
  debug2: peer server KEXINIT proposal
  debug2: KEX algorithms: diffie-hellman-group-exchange-sha1,diffie-hellman-group1-sha1,diffie-hellman-group14-sha1
  debug2: host key algorithms: ssh-rsa,ssh-dss
  debug2: ciphers ctos: aes128-ctr,aes192-ctr,aes256-ctr,chacha20-poly1305@openssh.com
  debug2: ciphers stoc: aes128-ctr,aes192-ctr,aes256-ctr,chacha20-poly1305@openssh.com
  debug2: MACs ctos: hmac-sha1
  debug2: MACs stoc: hmac-sha1
  debug2: compression ctos: none
  debug2: compression stoc: none
  debug2: languages ctos: 
  debug2: languages stoc: 
  debug2: first_kex_follows 0 
  debug2: reserved 0 
  debug1: kex: algorithm: diffie-hellman-group14-sha1
  debug1: kex: host key algorithm: ssh-rsa
  debug1: kex: server-&gt;client cipher: chacha20-poly1305@openssh.com MAC: &lt;implicit&gt; compression: none
  debug1: kex: client-&gt;server cipher: chacha20-poly1305@openssh.com MAC: &lt;implicit&gt; compression: none
  debug1: sending SSH2_MSG_KEXDH_INIT
  debug2: bits set: 1001/2048
  debug3: send packet: type 30
  debug1: expecting SSH2_MSG_KEXDH_REPLY
  debug3: receive packet: type 31
  debug1: Server host key: ssh-rsa SHA256:dS79N4clCGySrehvWW5kpCRgm3VXlYClD0pyoaYSNoQ
  debug3: hostkeys_foreach: reading file &quot;/root/.ssh/known_hosts&quot;
  debug3: record_hostkey: found key type RSA in file /root/.ssh/known_hosts:9
  debug3: load_hostkeys: loaded 1 keys from 10.34.35.11
  debug1: Host '10.39.31.11' is known and matches the RSA host key.
  debug1: Found key in /root/.ssh/known_hosts:9
  debug2: bits set: 1068/2048
  debug3: send packet: type 21
  debug2: set_newkeys: mode 1
  debug1: rekey after 134217728 blocks
  debug1: SSH2_MSG_NEWKEYS sent
  debug1: expecting SSH2_MSG_NEWKEYS
  debug3: receive packet: type 21
  debug1: SSH2_MSG_NEWKEYS received
  debug2: set_newkeys: mode 0
  debug1: rekey after 134217728 blocks
  debug1: Will attempt key: /root/.ssh/id_rsa 
  debug1: Will attempt key: /root/.ssh/id_dsa 
  debug1: Will attempt key: /root/.ssh/id_ecdsa 
  debug1: Will attempt key: /root/.ssh/id_ed25519 
  debug1: Will attempt key: /root/.ssh/id_xmss 
  debug2: pubkey_prepare: done
  debug3: send packet: type 5
  debug3: receive packet: type 7
  debug1: SSH2_MSG_EXT_INFO received
  debug1: kex_input_ext_info: server-sig-algs=&lt;rsa-sha2-256,rsa-sha2-512&gt;
  debug3: receive packet: type 6
  debug2: service_accept: ssh-userauth
  debug1: SSH2_MSG_SERVICE_ACCEPT received
  debug3: send packet: type 50
  debug3: receive packet: type 52
  debug1: Authentication succeeded (none).
  
  Authenticated to 10.39.31.11 ([10.39.31.11]:22).
  
  debug1: channel 0: new [client-session]
  debug3: ssh_session2_open: channel_new: 0
  debug2: channel 0: send open
  debug3: send packet: type 90
  debug1: Requesting no-more-sessions@openssh.com
  debug3: send packet: type 80
  debug1: Entering interactive session.
  debug1: pledge: network
  debug3: receive packet: type 91
  debug2: channel_input_open_confirmation: channel 0: callback start
  debug2: fd 5 setting TCP_NODELAY
  debug3: ssh_packet_set_tos: set IP_TOS 0x08
  debug2: client_session2_setup: id 0
  debug2: channel 0: request pty-req confirm 1
  debug3: send packet: type 98
  debug1: Sending environment.
  debug3: Ignored env LS_COLORS
  debug3: Ignored env SSH_CONNECTION
  debug1: Sending env LANG = en_US.UTF-8
  debug2: channel 0: request env confirm 0
  debug3: send packet: type 98
  debug3: Ignored env XDG_SESSION_ID
  debug3: Ignored env USER
  debug3: Ignored env PWD
  debug3: Ignored env HOME
  debug3: Ignored env SSH_CLIENT
  debug3: Ignored env SSH_TTY
  debug3: Ignored env MAIL
  debug3: Ignored env TERM
  debug3: Ignored env SHELL
  debug3: Ignored env SHLVL
  debug3: Ignored env LOGNAME
  debug3: Ignored env DBUS_SESSION_BUS_ADDRESS
  debug3: Ignored env XDG_RUNTIME_DIR
  debug3: Ignored env PATH
  debug3: Ignored env _
  debug2: channel 0: request shell confirm 1
  debug3: send packet: type 98
  debug2: channel_input_open_confirmation: channel 0: callback done
  debug2: channel 0: open confirm rwindow 2097152 rmax 32768
  debug3: receive packet: type 99
  debug2: channel_input_status_confirm: type 99 id 0
  debug2: PTY allocation request accepted on channel 0
  debug3: receive packet: type 99
  debug2: channel_input_status_confirm: type 99 id 0
  debug2: shell request accepted on channel 0
  
  
  
  
  User Name:wrong_credentils_don't_effect_the_logs
  Password:***
  
  User Name:cisco
  Password:************
  
  Switch1&gt;exit
  debug3: receive packet: type 97
  debug2: channel 0: rcvd close
  debug2: channel 0: output open -&gt; drain
  debug2: channel 0: chan_shutdown_read (i0 o1 sock -1 wfd 6 efd 8 [write])
  debug2: channel 0: input open -&gt; closed
  debug3: channel 0: will not send data after close
  debug3: channel 0: will not send data after close
  debug2: channel 0: obuf empty
  debug2: channel 0: chan_shutdown_write (i3 o1 sock -1 wfd 7 efd 8 [write])
  debug2: channel 0: output drain -&gt; closed
  debug2: channel 0: almost dead
  debug2: channel 0: gc: notify user
  debug2: channel 0: gc: user detached
  debug2: channel 0: send close
  debug3: send packet: type 97
  debug2: channel 0: is dead
  debug2: channel 0: garbage collecting
  debug1: channel 0: free: client-session, nchannels 1
  debug3: channel 0: status: The following connections are open:
    #0 client-session (t4 r0 i3/0 o3/0 e[write]/0 fd -1/-1/8 sock -1 cc -1)
  
  debug3: send packet: type 1
  debug3: fd 1 is not O_NONBLOCK
  Connection to 10.39.31.11 closed.
  Transferred: sent 3552, received 2776 bytes, in 28.7 seconds
  Bytes per second: sent 123.9, received 96.8
  debug1: Exit status -1
  </code></pre>
  <p>And paramiko log file:</p>
  <pre><code>DEB [20181204-11:25:17.677] thr=1   paramiko.transport: starting thread (client mode): 0x3c1fed0
  DEB [20181204-11:25:17.677] thr=1   paramiko.transport: Local version/idstring: SSH-2.0-paramiko_2.4.2
  DEB [20181204-11:25:17.695] thr=1   paramiko.transport: Remote version/idstring: SSH-2.0-OpenSSH_7.3p1.RL
  INF [20181204-11:25:17.695] thr=1   paramiko.transport: Connected (version 2.0, client OpenSSH_7.3p1.RL)
  DEB [20181204-11:25:18.015] thr=1   paramiko.transport: kex algos:['diffie-hellman-group-exchange-sha1', 'diffie-hellman-group1-sha1', 'diffie-hellman-group14-sha1'] server key:['ssh-rsa', 'ssh-dss'] client encrypt:['aes128-ctr', 'aes192-ctr', 'aes256-ctr', 'chacha20-poly1305@openssh.com'] server encrypt:['aes128-ctr', 'aes192-ctr', 'aes256-ctr', 'chacha20-poly1305@openssh.com'] client mac:['hmac-sha1'] server mac:['hmac-sha1'] client compress:['none'] server compress:['none'] client lang:[''] server lang:[''] kex follows?False
  DEB [20181204-11:25:18.016] thr=1   paramiko.transport: Kex agreed: diffie-hellman-group-exchange-sha1
  DEB [20181204-11:25:18.016] thr=1   paramiko.transport: HostKey agreed: ssh-rsa
  DEB [20181204-11:25:18.016] thr=1   paramiko.transport: Cipher agreed: aes128-ctr
  DEB [20181204-11:25:18.016] thr=1   paramiko.transport: MAC agreed: hmac-sha1
  DEB [20181204-11:25:18.016] thr=1   paramiko.transport: Compression agreed: none
  DEB [20181204-11:25:18.027] thr=1   paramiko.transport: Got server p (2048 bits)
  DEB [20181204-11:25:18.459] thr=1   paramiko.transport: kex engine KexGex specified hash_algo &lt;built-in function openssl_sha1&gt;
  DEB [20181204-11:25:18.459] thr=1   paramiko.transport: Switch to new keys ...
  DEB [20181204-11:25:18.460] thr=2   paramiko.transport: Adding ssh-rsa host key for 10.39.31.11: b'd6d12a09458873202a0e271b90d38a7d'
  DEB [20181204-11:25:18.936] thr=1   paramiko.transport: userauth is OK
  DEB [20181204-11:25:18.940] thr=1   paramiko.transport: Authentication type (password) not permitted.
  DEB [20181204-11:25:18.940] thr=1   paramiko.transport: Allowed methods: ['']
  DEB [20181204-11:25:18.941] thr=1   paramiko.transport: EOF in transport thread
  DEB [20181204-11:25:18.946] thr=3   paramiko.transport: starting thread (client mode): 0x386b0f0
  DEB [20181204-11:25:18.947] thr=3   paramiko.transport: Local version/idstring: SSH-2.0-paramiko_2.4.2
  DEB [20181204-11:25:19.245] thr=3   paramiko.transport: Remote version/idstring: SSH-2.0-OpenSSH_7.3p1.RL
  INF [20181204-11:25:19.245] thr=3   paramiko.transport: Connected (version 2.0, client OpenSSH_7.3p1.RL)
  DEB [20181204-11:25:19.566] thr=3   paramiko.transport: kex algos:['diffie-hellman-group-exchange-sha1', 'diffie-hellman-group1-sha1', 'diffie-hellman-group14-sha1'] server key:['ssh-rsa', 'ssh-dss'] client encrypt:['aes128-ctr', 'aes192-ctr', 'aes256-ctr', 'chacha20-poly1305@openssh.com'] server encrypt:['aes128-ctr', 'aes192-ctr', 'aes256-ctr', 'chacha20-poly1305@openssh.com'] client mac:['hmac-sha1'] server mac:['hmac-sha1'] client compress:['none'] server compress:['none'] client lang:[''] server lang:[''] kex follows?False
  DEB [20181204-11:25:19.566] thr=3   paramiko.transport: Kex agreed: diffie-hellman-group-exchange-sha1
  DEB [20181204-11:25:19.566] thr=3   paramiko.transport: HostKey agreed: ssh-rsa
  DEB [20181204-11:25:19.566] thr=3   paramiko.transport: Cipher agreed: aes128-ctr
  DEB [20181204-11:25:19.566] thr=3   paramiko.transport: MAC agreed: hmac-sha1
  DEB [20181204-11:25:19.567] thr=3   paramiko.transport: Compression agreed: none
  DEB [20181204-11:25:19.576] thr=3   paramiko.transport: Got server p (2048 bits)
  DEB [20181204-11:25:19.946] thr=3   paramiko.transport: kex engine KexGex specified hash_algo &lt;built-in function openssl_sha1&gt;
  DEB [20181204-11:25:19.946] thr=3   paramiko.transport: Switch to new keys ...
  DEB [20181204-11:25:19.947] thr=2   paramiko.transport: Adding ssh-rsa host key for 10.39.31.11: b'd6d12a09458873202a0e271b90d38a7d'
  DEB [20181204-11:25:20.486] thr=3   paramiko.transport: userauth is OK
  DEB [20181204-11:25:20.491] thr=3   paramiko.transport: Authentication type (password) not permitted.
  DEB [20181204-11:25:20.491] thr=3   paramiko.transport: Allowed methods: ['']
  DEB [20181204-11:25:20.492] thr=3   paramiko.transport: EOF in transport thread
  </code></pre>
  <p>The exception string program throws:</p>
  <pre><code>[*] Testing connection...
  [*] Getting banner...
  [+] Banner =&gt; SSH-2.0-OpenSSH_7.3p1.RL
  [-] Failed to connect =&gt; 10.39.31.11:22 (('Bad authentication type', ['']) (allowed_types=['']))
  [*] Exiting...
  </code></pre>
  <p>Thank you very much.</p>
  <p><a href="https://i.stack.imgur.com/D9cns.png" rel="nofollow noreferrer">Cisco ssh connection screen</a></p>