[Bug 237894] Re: I cannot connect to any server. Conection hangs up at "channel 0: open confirm rwindow 0 rmax 32768"

Claude Petit 237894 at bugs.launchpad.net
Thu Sep 1 22:48:39 UTC 2011 

Today, the same problem is appearing on all of our Amazon Cloud Servers.
We are using 4 different client machines, wireless or not. It's not
related to drivers. I know SSH does reverse lookup by default. Can it be
the issue ?

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https://bugs.launchpad.net/bugs/237894

Title:
  I cannot connect to any server. Conection hangs up at "channel 0: open
  confirm rwindow 0 rmax 32768"

Status in “linux-restricted-modules-2.6.24” package in Ubuntu:
  Won't Fix
Status in “openssh” package in Ubuntu:
  Invalid

Bug description:
  I can't connect to any server trough ssh.
  Here is an example of what happens:

  janus at ernestina:~$ ssh -vvv diazcaro at eva.fceia.unr.edu.ar
  OpenSSH_4.7p1 Debian-8ubuntu1.2, OpenSSL 0.9.8g 19 Oct 2007
  debug1: Reading configuration data /etc/ssh/ssh_config
  debug1: Applying options for *
  debug2: ssh_connect: needpriv 0
  debug1: Connecting to eva.fceia.unr.edu.ar [200.3.123.187] port 22.
  debug1: Connection established.
  debug1: identity file /home/janus/.ssh/identity type -1
  debug3: Not a RSA1 key file /home/janus/.ssh/id_rsa.
  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
  debug2: key_type_from_name: unknown key type '-----END'
  debug3: key_read: missing keytype
  debug1: identity file /home/janus/.ssh/id_rsa type 1
  debug1: identity file /home/janus/.ssh/id_dsa type -1
  debug1: Remote protocol version 2.0, remote software version OpenSSH_4.3p2 Debian-9etch2
  debug1: match: OpenSSH_4.3p2 Debian-9etch2 pat OpenSSH*
  debug1: Enabling compatibility mode for protocol 2.0
  debug1: Local version string SSH-2.0-OpenSSH_4.7p1 Debian-8ubuntu1.2
  debug2: fd 3 setting O_NONBLOCK
  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 at 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 at lysator.liu.se,aes128-ctr,aes192-ctr,aes256-ctr
  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: 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 at 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 at lysator.liu.se,aes128-ctr,aes192-ctr,aes256-ctr
  debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,hmac-ripemd160,hmac-ripemd160 at openssh.com,hmac-sha1-96,hmac-md5-96
  debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,hmac-ripemd160,hmac-ripemd160 at openssh.com,hmac-sha1-96,hmac-md5-96
  debug2: kex_parse_kexinit: none,zlib at openssh.com
  debug2: kex_parse_kexinit: none,zlib at 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
  debug1: kex: server->client aes128-cbc hmac-md5 none
  debug2: mac_setup: 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: 132/256
  debug2: bits set: 522/1024
  debug1: SSH2_MSG_KEX_DH_GEX_INIT sent
  debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY
  debug3: check_host_in_hostfile: filename /home/janus/.ssh/known_hosts
  debug3: check_host_in_hostfile: match line 5
  debug3: check_host_in_hostfile: filename /home/janus/.ssh/known_hosts
  debug3: check_host_in_hostfile: match line 6
  debug1: Host 'eva.fceia.unr.edu.ar' is known and matches the RSA host key.
  debug1: Found key in /home/janus/.ssh/known_hosts:5
  debug2: bits set: 513/1024
  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/janus/.ssh/identity ((nil))
  debug2: key: /home/janus/.ssh/id_rsa (0x7ffe48b7c2d0)
  debug2: key: /home/janus/.ssh/id_dsa ((nil))
  debug1: Authentications that can continue: publickey,keyboard-interactive
  debug3: start over, passed a different list publickey,keyboard-interactive
  debug3: preferred gssapi-keyex,gssapi-with-mic,gssapi,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/janus/.ssh/identity
  debug3: no such identity: /home/janus/.ssh/identity
  debug1: Offering public key: /home/janus/.ssh/id_rsa
  debug3: send_pubkey_test
  debug2: we sent a publickey packet, wait for reply
  debug1: Server accepts key: pkalg ssh-rsa blen 277
  debug2: input_userauth_pk_ok: fp 5c:e1:31:aa:37:09:c4:1b:23:49:84:b9:84:92:8b:7c
  debug3: sign_and_send_pubkey
  debug1: read PEM private key done: type RSA
  debug1: Authentication succeeded (publickey).
  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: channel 0: request pty-req confirm 0
  debug3: tty_make_modes: ospeed 38400
  debug3: tty_make_modes: ispeed 38400
  debug3: tty_make_modes: 1 3
  debug3: tty_make_modes: 2 28
  debug3: tty_make_modes: 3 127
  debug3: tty_make_modes: 4 21
  debug3: tty_make_modes: 5 4
  debug3: tty_make_modes: 6 0
  debug3: tty_make_modes: 7 0
  debug3: tty_make_modes: 8 17
  debug3: tty_make_modes: 9 19
  debug3: tty_make_modes: 10 26
  debug3: tty_make_modes: 12 18
  debug3: tty_make_modes: 13 23
  debug3: tty_make_modes: 14 22
  debug3: tty_make_modes: 18 15
  debug3: tty_make_modes: 30 0
  debug3: tty_make_modes: 31 0
  debug3: tty_make_modes: 32 0
  debug3: tty_make_modes: 33 0
  debug3: tty_make_modes: 34 0
  debug3: tty_make_modes: 35 0
  debug3: tty_make_modes: 36 1
  debug3: tty_make_modes: 37 0
  debug3: tty_make_modes: 38 0
  debug3: tty_make_modes: 39 0
  debug3: tty_make_modes: 40 0
  debug3: tty_make_modes: 41 0
  debug3: tty_make_modes: 50 1
  debug3: tty_make_modes: 51 1
  debug3: tty_make_modes: 52 0
  debug3: tty_make_modes: 53 1
  debug3: tty_make_modes: 54 1
  debug3: tty_make_modes: 55 1
  debug3: tty_make_modes: 56 0
  debug3: tty_make_modes: 57 0
  debug3: tty_make_modes: 58 0
  debug3: tty_make_modes: 59 1
  debug3: tty_make_modes: 60 1
  debug3: tty_make_modes: 61 1
  debug3: tty_make_modes: 62 0
  debug3: tty_make_modes: 70 1
  debug3: tty_make_modes: 71 0
  debug3: tty_make_modes: 72 1
  debug3: tty_make_modes: 73 0
  debug3: tty_make_modes: 74 0
  debug3: tty_make_modes: 75 0
  debug3: tty_make_modes: 90 1
  debug3: tty_make_modes: 91 1
  debug3: tty_make_modes: 92 0
  debug3: tty_make_modes: 93 0
  debug1: Sending environment.
  debug3: Ignored env KDE_MULTIHEAD
  debug3: Ignored env SSH_AGENT_PID
  debug3: Ignored env DM_CONTROL
  debug3: Ignored env TERM
  debug3: Ignored env SHELL
  debug3: Ignored env KDEWM
  debug3: Ignored env XDG_SESSION_COOKIE
  debug3: Ignored env XDM_MANAGED
  debug3: Ignored env GTK2_RC_FILES
  debug3: Ignored env GTK_RC_FILES
  debug3: Ignored env GS_LIB
  debug3: Ignored env WINDOWID
  debug3: Ignored env KDE_FULL_SESSION
  debug3: Ignored env USER
  debug3: Ignored env LS_COLORS
  debug3: Ignored env SSH_AUTH_SOCK
  debug3: Ignored env SESSION_MANAGER
  debug3: Ignored env DCOP_YAKUAKE_SESSION
  debug3: Ignored env KONSOLE_DCOP
  debug3: Ignored env PATH
  debug3: Ignored env DESKTOP_SESSION
  debug3: Ignored env KONSOLE_DCOP_SESSION
  debug3: Ignored env PWD
  debug3: Ignored env KDE_SESSION_UID
  debug1: Sending env LANG = es_AR.UTF-8
  debug2: channel 0: request env confirm 0
  debug3: Ignored env HISTCONTROL
  debug3: Ignored env HOME
  debug3: Ignored env SHLVL
  debug3: Ignored env LANGUAGE
  debug3: Ignored env XCURSOR_THEME
  debug3: Ignored env LOGNAME
  debug3: Ignored env LESSOPEN
  debug3: Ignored env DISPLAY
  debug3: Ignored env LESSCLOSE
  debug3: Ignored env COLORTERM
  debug3: Ignored env DCOP_YAKUAKE_TERMINAL
  debug3: Ignored env _
  debug2: channel 0: request shell confirm 0
  debug2: fd 3 setting TCP_NODELAY
  debug2: callback done
  debug2: channel 0: open confirm rwindow 0 rmax 32768

  And then, the terminal hangs up. It does not respond even to ctrl-c, I
  have to kill it.

  Following is the policy for openssh-client in my Hardy 64bits:

  janus at ernestina:~$ apt-cache policy openssh-client
  openssh-client:
    Instalados: 1:4.7p1-8ubuntu1.2
    Candidato: 1:4.7p1-8ubuntu1.2
    Tabla de versión:
   *** 1:4.7p1-8ubuntu1.2 0
          500 http://ftp.usf.edu hardy-updates/main Packages
          500 http://ftp.usf.edu hardy-security/main Packages
          100 /var/lib/dpkg/status
       1:4.7p1-8ubuntu1 0
          500 http://ftp.usf.edu hardy/main Packages

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