[Bug 708493] Re: cannot login anymore: Read from socket failed: Connection reset by peer

Sat Dec 17 14:18:13 UTC 2011

I'm in the same situation, and shortening the cipher list didn't help.
I've tried via terminal with ‘ssh -c aes256-ctr host’ and by editing
/etc/ssh/ssh_config, and removing some ciphers off the cipher list. Same
result. This bug is now almost a year old. Being critical, I get the
feeling it's not having development at all, although it cripples SSH to
a halt. Can someone provide a solution for this?

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Title:
  cannot login anymore: Read from socket failed: Connection reset by
  peer

Status in “openssh” package in Ubuntu:
  Confirmed
Status in “openssh” package in Debian:
  New

Bug description:
  After todays update to
  1:5.7p1-1ubuntu1
  I cannot login to SOME (!) of my servers. Example of a server failing:

  ~$ ssh -v root at mail
  OpenSSH_5.7p1 Debian-1ubuntu1, OpenSSL 0.9.8o 01 Jun 2010
  debug1: Reading configuration data /home/hildeb/.ssh/config
  debug1: Reading configuration data /etc/ssh/ssh_config
  debug1: Applying options for *
  debug1: Connecting to mail [141.42.202.200] port 22.
  debug1: Connection established.
  debug1: identity file /home/hildeb/.ssh/id_rsa type -1
  debug1: identity file /home/hildeb/.ssh/id_rsa-cert type -1
  debug1: identity file /home/hildeb/.ssh/id_dsa type 2
  debug1: Checking blacklist file /usr/share/ssh/blacklist.DSA-1024
  debug1: Checking blacklist file /etc/ssh/blacklist.DSA-1024
  debug1: identity file /home/hildeb/.ssh/id_dsa-cert type -1
  debug1: identity file /home/hildeb/.ssh/id_ecdsa type -1
  debug1: identity file /home/hildeb/.ssh/id_ecdsa-cert type -1
  debug1: Remote protocol version 1.99, remote software version OpenSSH_5.5p1 Debian-6
  debug1: match: OpenSSH_5.5p1 Debian-6 pat OpenSSH*
  debug1: Enabling compatibility mode for protocol 2.0
  debug1: Local version string SSH-2.0-OpenSSH_5.7p1 Debian-1ubuntu1
  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: SSH2_MSG_KEX_DH_GEX_REQUEST(1024<1024<8192) sent
  debug1: expecting SSH2_MSG_KEX_DH_GEX_GROUP
  Read from socket failed: Connection reset by peer

  There is NOTHING in daemon.log, auth.log or syslog on the server I'm
  trying to connect to.

  Example of a server NOT failing:

  $ ssh -v root at netsight
  OpenSSH_5.7p1 Debian-1ubuntu1, OpenSSL 0.9.8o 01 Jun 2010
  debug1: Reading configuration data /home/hildeb/.ssh/config
  debug1: Reading configuration data /etc/ssh/ssh_config
  debug1: Applying options for *
  debug1: Connecting to netsight [10.47.2.222] port 22.
  debug1: Connection established.
  debug1: identity file /home/hildeb/.ssh/id_rsa type -1
  debug1: identity file /home/hildeb/.ssh/id_rsa-cert type -1
  debug1: identity file /home/hildeb/.ssh/id_dsa type 2
  debug1: Checking blacklist file /usr/share/ssh/blacklist.DSA-1024
  debug1: Checking blacklist file /etc/ssh/blacklist.DSA-1024
  debug1: identity file /home/hildeb/.ssh/id_dsa-cert type -1
  debug1: identity file /home/hildeb/.ssh/id_ecdsa type -1
  debug1: identity file /home/hildeb/.ssh/id_ecdsa-cert type -1
  debug1: Remote protocol version 2.0, remote software version OpenSSH_5.5p1 Debian-6
  debug1: match: OpenSSH_5.5p1 Debian-6 pat OpenSSH*
  debug1: Enabling compatibility mode for protocol 2.0
  debug1: Local version string SSH-2.0-OpenSSH_5.7p1 Debian-1ubuntu1
  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: SSH2_MSG_KEX_DH_GEX_REQUEST(1024<1024<8192) sent
  debug1: expecting SSH2_MSG_KEX_DH_GEX_GROUP
  debug1: SSH2_MSG_KEX_DH_GEX_INIT sent
  debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY
  debug1: Server host key: RSA 18:ce:76:c7:7c:f4:98:94:28:8f:62:4a:31:e8:5b:c9
  debug1: Host 'netsight' is known and matches the RSA host key.
  debug1: Found key in /home/hildeb/.ssh/known_hosts:56
  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,keyboard-interactive
  debug1: Next authentication method: publickey
  debug1: Offering DSA public key: /home/hildeb/.ssh/id_dsa
  debug1: Server accepts key: pkalg ssh-dss blen 433
  debug1: Authentication succeeded (publickey).
  Authenticated to netsight ([10.47.2.222]:22).
  debug1: channel 0: new [client-session]
  debug1: Requesting no-more-sessions at openssh.com
  debug1: Entering interactive session.
  debug1: Sending environment.
  debug1: Sending env LC_MESSAGES = en_US.utf8
  debug1: Sending env LANG = de_DE.UTF-8

  ProblemType: Bug
  DistroRelease: Ubuntu 11.04
  Package: openssh-client 1:5.7p1-1ubuntu1
  ProcVersionSignature: Ubuntu 2.6.37-12.26-generic 2.6.37
  Uname: Linux 2.6.37-12-generic x86_64
  Architecture: amd64
  Date: Thu Jan 27 09:13:15 2011
  ProcEnviron:
   LANGUAGE=en_US:en
   LANG=de_DE.UTF-8
   LC_MESSAGES=en_US.utf8
   SHELL=/bin/bash
  RelatedPackageVersions:
   ssh-askpass N/A
   libpam-ssh N/A
   keychain N/A
   ssh-askpass-gnome 1:5.7p1-1ubuntu1
  SSHClientVersion: OpenSSH_5.7p1 Debian-1ubuntu1, OpenSSL 0.9.8o 01 Jun 2010
  SourcePackage: openssh

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