it doesn't prompt for password.
---------- Post updated at 11:47 AM ---------- Previous update was at 11:46 AM ----------
User A and B are both normal user with the same group.
---------- Post updated at 12:06 PM ---------- Previous update was at 11:47 AM ----------
Here is some of the debug output
server1:userA:/home/userA# ssh -vvv server1 -l userB
OpenSSH_3.8.1p1, OpenSSL 0.9.7d 17 Mar 2004
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: Applying options for *
debug3: RNG is ready, skipping seeding
debug2: ssh_connect: needpriv 0
debug1: Connecting to server1 [XXX.XXX.XX.XX] port 22.
debug1: Connection established.
debug1: identity file /home/userA/.ssh/identity type -1
debug3: Not a RSA1 key file /home/userA/.ssh/id_rsa.
debug2: key_type_from_name: unknown key type '-----BEGIN'
debug3: key_read: missing keytype
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug2: key_type_from_name: unknown key type '-----END'
debug3: key_read: missing keytype
debug1: identity file /home/userA/.ssh/id_rsa type 1
debug3: Not a RSA1 key file /home/userA/.ssh/id_dsa.
debug2: key_type_from_name: unknown key type '-----BEGIN'
debug3: key_read: missing keytype
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug2: key_type_from_name: unknown key type '-----END'
debug3: key_read: missing keytype
debug1: identity file /home/userA/.ssh/id_dsa type 2
debug1: Remote protocol version 2.0, remote software version OpenSSH_3.8.1p1
debug1: match: OpenSSH_3.8.1p1 pat OpenSSH*
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_3.8.1p1
debug3: RNG is ready, skipping seeding
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug2: kex_parse_kexinit: none,zlib
debug2: kex_parse_kexinit: none,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_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
debug2: dh_gen_key: priv key bits set: 145/256
debug2: bits set: 522/1024
debug1: SSH2_MSG_KEX_DH_GEX_INIT sent
debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY
debug3: check_host_in_hostfile: filename /home/userA/.ssh/known_hosts
debug3: check_host_in_hostfile: match line 15
debug3: check_host_in_hostfile: filename /home/userA/.ssh/known_hosts
debug3: check_host_in_hostfile: match line 15
debug1: Host 'server1' is known and matches the RSA host key.
debug1: Found key in /home/userA/.ssh/known_hosts:15
debug2: bits set: 521/1024
debug1: ssh_rsa_verify: signature correct
debug2: kex_derive_keys
debug2: set_newkeys: mode 1
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug2: set_newkeys: mode 0
debug1: SSH2_MSG_NEWKEYS received
debug1: SSH2_MSG_SERVICE_REQUEST sent
debug2: service_accept: ssh-userauth
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug2: key: /home/userA/.ssh/identity (0)
debug2: key: /home/userA/.ssh/id_rsa (122a80)
debug2: key: /home/userA/.ssh/id_dsa (1203f8)
debug1: Authentications that can continue: publickey,password,keyboard-interactive,hostbased
debug3: start over, passed a different list publickey,password,keyboard-interactive,hostbased
debug3: preferred hostbased,publickey,keyboard-interactive,password
debug3: authmethod_lookup hostbased
debug3: remaining preferred: publickey,keyboard-interactive,password
debug3: authmethod_is_enabled hostbased
debug1: Next authentication method: hostbased
debug2: userauth_hostbased: chost server1.
debug2: ssh_keysign called
debug3: ssh_msg_send: type 2
debug3: ssh_msg_recv entering
debug2: we sent a hostbased packet, wait for reply
debug1: Remote: Ignoring wild host/user names in /home/userB/.rhosts.
debug1: Authentications that can continue: publickey,password,keyboard-interactive,hostbased
debug2: userauth_hostbased: chost server1.
debug2: ssh_keysign called
debug3: ssh_msg_send: type 2
debug3: ssh_msg_recv entering
debug2: we sent a hostbased packet, wait for reply
debug1: Remote: Ignoring wild host/user names in /home/userB/.rhosts.
debug1: Authentications that can continue: publickey,password,keyboard-interactive,hostbased
debug1: No more client hostkeys for hostbased authentication.
debug2: we did not send a packet, disable method
debug3: authmethod_lookup publickey
debug3: remaining preferred: keyboard-interactive,password
debug3: authmethod_is_enabled publickey
debug1: Next authentication method: publickey
debug1: Trying private key: /home/userA/.ssh/identity
debug3: no such identity: /home/userA/.ssh/identity
debug1: Offering public key: /home/userA/.ssh/id_rsa
debug3: send_pubkey_test
debug2: we sent a publickey packet, wait for reply
debug1: Authentications that can continue: publickey,password,keyboard-interactive,hostbased
debug1: Offering public key: /home/userA/.ssh/id_dsa
debug3: send_pubkey_test
debug2: we sent a publickey packet, wait for reply
Connection closed by XXX.XXX.XX.XX