Server might be getting DOS'd.

Tweak MaxStartups in sshd_conf

Ken.



________________________________
From: Paolo Stancato <paolodo...@yahoo.com.ar>
To: tommymcgui...@yahoo.com.au
Sent: Monday, 1 June, 2009 10:22:11 AM
Subject: [Bug 174168] Re:  expecting SSH2_MSG_KEX_DH_GEX_GROUP

Same problem trying to connect to Github, MTU trick did not help. I'm
running Jaunty

pa...@darkstar:~$ uname -a
Linux darkstar 2.6.28-12-generic #43-Ubuntu SMP Fri May 1 19:31:32 UTC 2009 
x86_64 GNU/Linux
pa...@darkstar:~$ ssh -v g...@github.com
OpenSSH_5.1p1 Debian-5ubuntu1, OpenSSL 0.9.8g 19 Oct 2007
debug1: Reading configuration data /home/paolo/.ssh/config
debug1: Applying options for *
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: Applying options for *
debug1: Connecting to github.com [65.74.177.129] port 22.
debug1: Connection established.
debug1: identity file /home/paolo/.ssh/identity type -1
debug1: identity file /home/paolo/.ssh/id_rsa type -1
debug1: identity file /home/paolo/.ssh/id_dsa type 2
debug1: Checking blacklist file /usr/share/ssh/blacklist.DSA-2048
debug1: Checking blacklist file /etc/ssh/blacklist.DSA-2048
debug1: Remote protocol version 2.0, remote software version OpenSSH_4.7
debug1: match: OpenSSH_4.7 pat OpenSSH_4*
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_5.1p1 Debian-5ubuntu1
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug1: kex: server->client aes128-cbc hmac-md5 none
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
Connection closed by 65.74.177.129

-- 
expecting SSH2_MSG_KEX_DH_GEX_GROUP
https://bugs.launchpad.net/bugs/174168
You received this bug notification because you are a direct subscriber
of the bug.

Status in “openssh” source package in Ubuntu: Invalid

Bug description:
Server 
Connected to xxxxxxxx
Escape character is '^]'.
SSH-2.0-OpenSSH_4.5

Client
Local version string SSH-2.0-OpenSSH_4.6p1 Debian-5build1

=========================
The client can not log into the server - stops @ the last line (see below)
Client / server "speak" ver. 2.0

Connection server to client OK !!!
Connection client to server NOT OK!!

debug2: kex_parse_kexinit: first_kex_follows 0 
debug2: kex_parse_kexinit: reserved 0 
debug2: mac_init: found hmac-md5
debug1: kex: server->client aes128-cbc hmac-md5 none
debug2: mac_init: 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


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-- 
 expecting SSH2_MSG_KEX_DH_GEX_GROUP
https://bugs.launchpad.net/bugs/174168
You received this bug notification because you are a member of Ubuntu
Server Team, which is subscribed to openssh in ubuntu.

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