am trying connect to server via ssh after entering the password it's just keep stuck !!!

*** NOTE : i was using the server and am sure about the user name and password ...

Please advice ...

Stuck where? When you type "ssh hostname" does it ever give a login prompt? A password prompt? Any prompts after you've entered login and password?

Have you tried running with "ssh -v" or -vv or -vvv for debugging?

ye , i got password prompt after entering password it just stack !!

OpenSSH_5.3p1 Debian-3ubuntu6, OpenSSL 0.9.8k 25 Mar 2009
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: Applying options for *
debug1: Connecting to 10.10.120.52 [10.10.120.52] port 22.
debug1: Connection established.
debug1: identity file /home/moata/.ssh/identity type -1
debug1: identity file /home/moata/.ssh/id_rsa type -1
debug1: identity file /home/moata/.ssh/id_dsa type -1
debug1: Remote protocol version 2.0, remote software version Sun_SSH_1.1.1
debug1: no match: Sun_SSH_1.1.1
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_5.3p1 Debian-3ubuntu6
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: Host '10.10.120.52' is known and matches the RSA host key.
debug1: Found key in /home/moata/.ssh/known_hosts:9
debug1: ssh_rsa_verify: signature correct
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug1: SSH2_MSG_NEWKEYS received
debug1: SSH2_MSG_SERVICE_REQUEST sent
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug1: Authentications that can continue: gssapi-keyex,gssapi-with-mic,publickey,keyboard-interactive
debug1: Next authentication method: gssapi-keyex
debug1: No valid Key exchange context
debug1: Next authentication method: gssapi-with-mic
debug1: An invalid name was supplied
Cannot determine realm for numeric host address

debug1: An invalid name was supplied
Cannot determine realm for numeric host address

debug1: An invalid name was supplied


debug1: Next authentication method: publickey
debug1: Trying private key: /home/moata/.ssh/identity
debug1: Trying private key: /home/moata/.ssh/id_rsa
debug1: Trying private key: /home/moata/.ssh/id_dsa
debug1: Next authentication method: keyboard-interactive

Did you already configure the ssh on the computer you want to access,
Example: configure sshd in start up. it is in the Linux Control panel in system tab.

try ssh -v or ssh -vv.
In parallel open another session to the server and tail /var/log/messages. (When I say opening the server, I meant that you should connect to the server in the same way you were connecting earlier).