can't login via ssh

[yehudi]

I installed a fresh ubuntu 12.04 desktop with raid0 disks (so I installed postfix - I've read this could be a problem).
If I try to login via ssh to this new machine, I always receive this error:
Read from socket failed: Connection reset by peer

output ssh -vvv yehudi@192.168.1.5:
OpenSSH_5.9p1 Debian-5ubuntu1, OpenSSL 1.0.1 14 Mar 2012
debug1: Reading configuration data /home/yehudi/.ssh/config
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 19: Applying options for *
debug2: ssh_connect: needpriv 0
debug1: Connecting to 192.168.1.5 [192.168.1.5] port 22.
debug1: Connection established.
debug3: Incorrect RSA1 identifier
debug3: Could not load "/home/yehudi/.ssh/id_rsa" as a RSA1 public key
debug1: identity file /home/yehudi/.ssh/id_rsa type 1
debug1: Checking blacklist file /usr/share/ssh/blacklist.RSA-2048
debug1: Checking blacklist file /etc/ssh/blacklist.RSA-2048
debug1: identity file /home/yehudi/.ssh/id_rsa-cert type -1
debug1: identity file /home/yehudi/.ssh/id_dsa type -1
debug1: identity file /home/yehudi/.ssh/id_dsa-cert type -1
debug1: identity file /home/yehudi/.ssh/id_ecdsa type -1
debug1: identity file /home/yehudi/.ssh/id_ecdsa-cert type -1
debug1: Remote protocol version 2.0, remote software version OpenSSH_5.9p1 Debian-5ubuntu1
debug1: match: OpenSSH_5.9p1 Debian-5ubuntu1 pat OpenSSH*
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_5.9p1 Debian-5ubuntu1
debug2: fd 3 setting O_NONBLOCK
debug3: load_hostkeys: loading entries for host "192.168.1.5" from file "/home/yehudi/.ssh/known_hosts"
debug3: load_hostkeys: loaded 0 keys
debug1: SSH2_MSG_KEXINIT sent
Read from socket failed: Connection reset by peer

this is my sshd_config file:
IgnoreRhosts yes
IgnoreUserKnownHosts no
PrintMotd yes
StrictModes yes
PubkeyAuthentication yes
RSAAuthentication yes
PermitRootLogin no
PermitEmptyPasswords no
PasswordAuthentication yes

this is the ssh_config file:
# This is the ssh client system-wide configuration file. See
# ssh_config(5) for more information. This file provides defaults for
# users, and the values can be changed in per-user configuration files
# or on the command line.

# Configuration data is parsed as follows:
# 1. command line options
# 2. user-specific file
# 3. system-wide file
# Any configuration value is only changed the first time it is set.
# Thus, host-specific definitions should be at the beginning of the
# configuration file, and defaults at the end.

# Site-wide defaults for some commonly used options. For a comprehensive
# list of available options, their meanings and defaults, please see the
# ssh_config(5) man page.

Host *
# ForwardAgent no
# ForwardX11 no
# ForwardX11Trusted yes
# RhostsRSAAuthentication no
# RSAAuthentication yes
# PasswordAuthentication yes
# HostbasedAuthentication no
# GSSAPIAuthentication no
# GSSAPIDelegateCredentials no
# GSSAPIKeyExchange no
# GSSAPITrustDNS no
# BatchMode no
# CheckHostIP yes
# AddressFamily any
# ConnectTimeout 0
# StrictHostKeyChecking ask
# IdentityFile ~/.ssh/identity
# IdentityFile ~/.ssh/id_rsa
# IdentityFile ~/.ssh/id_dsa
# Port 22
# Protocol 2,1
# Cipher 3des
# Ciphers aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc
# MACs hmac-md5,hmac-sha1,<email address hidden>,hmac-ripemd160
# EscapeChar ~
# Tunnel no
# TunnelDevice any:any
# PermitLocalCommand no
# VisualHostKey no
# ProxyCommand ssh -q -W %h:%p gateway.example.com
    Cipher 3des
    Ciphers aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc
    SendEnv LANG LC_*
    HashKnownHosts yes
    GSSAPIAuthentication yes
    GSSAPIDelegateCredentials no

[Matt Darcy (matt-darcy)]

that looks as simple as sshd is not actually running.

[yehudi (inoffice-yehudi)]

sshd is running.
ps ax | grep ssh
  907 ? Ss 0:00 /usr/sbin/sshd -D

What I noticed is that on other machines where I'm able to login his is the output:
ps ax | grep ssh
  907 ? Ss 0:00 /usr/sbin/sshd -D
 1774 ? Ss 0:00 /usr/bin/ssh-agent /usr/bin/dbus-launch --exit-with-session gnome-session

As you can see there's also the ssh-agent which doesn't come out on the other server.

[yehudi (inoffice-yehudi)]

I purged openssh-server then reinstalled it and everything went fine!
Bug fixed