Comment 0 for bug 708493

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

~$ ssh -v root@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@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 <email address hidden>
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