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I have a server equipped with Ubuntu 12.04.3 LTS. The OS is newly installed. But I can not connect to it with SSH from any other non-Ubuntu client include RHEL, putty.

When using SSH -v, the debug information is listed:

OpenSSH_4.3p2, OpenSSL 0.9.8e-fips-rhel5 01 Jul 2008

debug1: Reading configuration data /home/hk/.ssh/config

debug1: Reading configuration data /etc/ssh/ssh_config

debug1: Applying options for *

debug1: Connecting to ..*.32 [..*.32] port 22.

debug1: Connection established.

debug1: identity file /home/hk/.ssh/identity type -1

debug1: identity file /home/hk/.ssh/id_rsa type 1

debug1: identity file /home/hk/.ssh/id_dsa type -1

debug1: loaded 3 keys

debug1: Remote protocol version 2.0, remote software version OpenSSH_5.9p1 Debian-5ubuntu1.1

debug1: match: OpenSSH_5.9p1 Debian-5ubuntu1.1 pat OpenSSH*

debug1: Enabling compatibility mode for protocol 2.0

debug1: Local version string SSH-2.0-OpenSSH_4.3

debug1: SSH2_MSG_KEXINIT sent

Then the connection hangs.

If connecting from a Ubuntu, it will be OK.

The sshd_config and ssh_config are completely the same to another Ubuntu 12.04.2 LTS server, which works very fine.

Where could the problem be ?

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