I have the same problem here. Only on one remote host:

sylock@sylock-vmware:~$ ssh -vvv XXXXXX
OpenSSH_6.0p1 Debian-3ubuntu1, OpenSSL 1.0.1c 10 May 2012
debug1: Reading configuration data /home/sylock/.ssh/config
debug1: /home/sylock/.ssh/config line 1: Applying options for *
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 XXXXXX[172.24.6.18] port 22.
debug1: Connection established.
debug1: identity file /home/sylock/.ssh/id_rsa type -1
debug1: identity file /home/sylock/.ssh/id_rsa-cert type -1
debug1: identity file /home/sylock/.ssh/id_dsa type -1
debug1: identity file /home/sylock/.ssh/id_dsa-cert type -1
debug1: identity file /home/sylock/.ssh/id_ecdsa type -1
debug1: identity file /home/sylock/.ssh/id_ecdsa-cert type -1
debug1: Remote protocol version 2.0, remote software version OpenSSH_5.1
debug1: match: OpenSSH_5.1 pat OpenSSH_5*
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_6.0p1 Debian-3ubuntu1
debug2: fd 3 setting O_NONBLOCK
debug3: load_hostkeys: loading entries for host "fsmal989" from file 
"/home/sylock/.ssh/known_hosts"
debug3: load_hostkeys: found key type RSA in file 
/home/sylock/.ssh/known_hosts:269
debug3: load_hostkeys: loaded 1 keys
debug3: order_hostkeyalgs: prefer hostkeyalgs: 
ssh-rsa-cert-...@openssh.com,ssh-rsa-cert-...@openssh.com,ssh-rsa
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug2: kex_parse_kexinit: 
ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1
debug2: kex_parse_kexinit: 
ssh-rsa-cert-...@openssh.com,ssh-rsa-cert-...@openssh.com,ssh-rsa,ecdsa-sha2-nistp256-cert-...@openssh.com,ecdsa-sha2-nistp384-cert-...@openssh.com,ecdsa-sha2-nistp521-cert-...@openssh.com,ssh-dss-cert-...@openssh.com,ssh-dss-cert-...@openssh.com,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,ssh-dss
debug2: kex_parse_kexinit: 
aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,rijndael-...@lysator.liu.se
debug2: kex_parse_kexinit: 
aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,rijndael-...@lysator.liu.se
debug2: kex_parse_kexinit: 
hmac-md5,hmac-sha1,umac...@openssh.com,hmac-sha2-256,hmac-sha2-256-96,hmac-sha2-512,hmac-sha2-512-96,hmac-ripemd160,hmac-ripemd...@openssh.com,hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: 
hmac-md5,hmac-sha1,umac...@openssh.com,hmac-sha2-256,hmac-sha2-256-96,hmac-sha2-512,hmac-sha2-512-96,hmac-ripemd160,hmac-ripemd...@openssh.com,hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: none,z...@openssh.com,zlib
debug2: kex_parse_kexinit: none,z...@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-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-...@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-...@lysator.liu.se,aes128-ctr,aes192-ctr,aes256-ctr
debug2: kex_parse_kexinit: 
hmac-md5,hmac-sha1,umac...@openssh.com,hmac-ripemd160,hmac-ripemd...@openssh.com,hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: 
hmac-md5,hmac-sha1,umac...@openssh.com,hmac-ripemd160,hmac-ripemd...@openssh.com,hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: none,z...@openssh.com,zlib
debug2: kex_parse_kexinit: none,z...@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: mac_setup: found hmac-md5
debug1: kex: server->client aes128-ctr hmac-md5 none
debug2: mac_setup: found hmac-md5
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
Write failed: Connection reset by peer


sylock@sylock-vmware:~$ ssh -V
OpenSSH_6.0p1 Debian-3ubuntu1, OpenSSL 1.0.1c 10 May 2012

sylock@sylock-vmware:~$ cat /etc/*release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=12.10
DISTRIB_CODENAME=quantal
DISTRIB_DESCRIPTION="Ubuntu 12.10"
NAME="Ubuntu"
VERSION="12.10, Quantal Quetzal"
ID=ubuntu
ID_LIKE=debian
PRETTY_NAME="Ubuntu quantal (12.10)"
VERSION_ID="12.10"

sylock@sylock-vmware:~$ ldd /usr/bin/ssh
        linux-vdso.so.1 =>  (0x00007ffff11c0000)
        libselinux.so.1 => /lib/x86_64-linux-gnu/libselinux.so.1 
(0x00007f14ce3e2000)
        libcrypto.so.1.0.0 => /lib/x86_64-linux-gnu/libcrypto.so.1.0.0 
(0x00007f14ce01b000)
        libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007f14cde16000)
        libz.so.1 => /lib/x86_64-linux-gnu/libz.so.1 (0x00007f14cdbff000)
        libresolv.so.2 => /lib/x86_64-linux-gnu/libresolv.so.2 
(0x00007f14cd9e3000)
        libgssapi_krb5.so.2 => /usr/lib/x86_64-linux-gnu/libgssapi_krb5.so.2 
(0x00007f14cd7a4000)
        libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f14cd3e5000)
        /lib64/ld-linux-x86-64.so.2 (0x00007f14ce881000)
        libkrb5.so.3 => /usr/lib/x86_64-linux-gnu/libkrb5.so.3 
(0x00007f14cd117000)
        libk5crypto.so.3 => /usr/lib/x86_64-linux-gnu/libk5crypto.so.3 
(0x00007f14cceed000)
        libcom_err.so.2 => /lib/x86_64-linux-gnu/libcom_err.so.2 
(0x00007f14ccce9000)
        libkrb5support.so.0 => /usr/lib/x86_64-linux-gnu/libkrb5support.so.0 
(0x00007f14ccae1000)
        libkeyutils.so.1 => /lib/x86_64-linux-gnu/libkeyutils.so.1 
(0x00007f14cc8dc000)
        libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 
(0x00007f14cc6bf000)

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https://bugs.launchpad.net/bugs/708493

Title:
  Can't login anymore: Read from socket failed: Connection reset by peer

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