Unable to ssh to another machine as another user without password

I am trying to set up ssh access between two specific user accounts
without being prompted for a password; however, I am still being
prompted for one. I will eventually need to communicate to and from
Solaris 8 and Red Hat Enterprise Linux v3, but for now I am simply
attempting to communicate between two Solaris machines.

What I've done thus far:
[user1@solaris1]: chmod 700 ~/.ssh
[user1@solaris1]: cd ~/.ssh
[user1@solaris1]: ssh-keygen -t dsa -f solaris1.id_dsa
(I gave an empty passphrase)
[user1@solaris1]: scp solaris1.id_dsa.pub user2@solaris2:~user2/.ssh/
solaris1.id_dsa.pub

[user2@solaris2]: chmod 700 ~/.ssh
[user2@solaris2]: cd ~/.ssh
[user2@solaris2]: cat solaris1.id_dsa.pub >> authorized_keys2
[user2@solaris2]: chmod 640 authorized_keys2
[user2@solaris2]: rm solaris1.id_dsa.pub

[user1@solaris1]: ssh -i ~/.ssh/solaris1.id_dsa user2@solaris2 pwd

Based on articles I've read, I would expect not to be prompted for a
password at this point. However, I still receive a password prompt.

I'm hoping someone can help me find what I've done wrong and correct
it.

Some information about the SSH versions that are loaded:
[user1@solaris1]: ssh -v
OpenSSH_3.6.1p2, SSH protocols 1.5/2.0. OpenSSL 0x0090707f

[user2@solaris2]: ssh -v
OpenSSH_3.6.1p2, SSH protocols 1.5/2.0. OpenSSL 0x0090707f


[user1@solaris1]: ssh -v -v -v -i ~/.ssh/solaris1.id_dsa
user2@solaris2 pwd
OpenSSH_3.6.1p2, SSH protocols 1.5/2.0, OpenSSL 0x0090707f
debug1: Rhosts Authentication disabled, originating port will not be
trusted.
debug2: ssh_connect: needpriv 0
debug1: Connecting to solaris2 [192.168.51.24] port 22.
debug1: Connection established.
debug3: Not a RSA1 key file /usr/user1/.ssh/nc.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
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
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 /usr/user1/.ssh/nc.id_dsa type 2
debug1: Remote protocol version 1.99, remote software version
OpenSSH_3.6.1p2
debug1: match: OpenSSH_3.6.1p2 pat OpenSSH*
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_3.6.1p2
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug2: kex_parse_kexinit: diffie-hellman-group-exchange-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,arcfour,aes192-cbc,aes256-cbc,rijndael-cbc@xxxxxxxxxxxxxx
debug2: kex_parse_kexinit: aes128-cbc,3des-cbc,blowfish-cbc,cast128-
cbc,arcfour,aes192-cbc,aes256-cbc,rijndael-cbc@xxxxxxxxxxxxxx
debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,hmac-ripemd160,hmac-
ripemd160@xxxxxxxxxxx,hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,hmac-ripemd160,hmac-
ripemd160@xxxxxxxxxxx,hmac-sha1-96,hmac-md5-96
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: kex_parse_kexinit: diffie-hellman-group-exchange-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,arcfour,aes192-cbc,aes256-cbc,rijndael-cbc@xxxxxxxxxxxxxx
debug2: kex_parse_kexinit: aes128-cbc,3des-cbc,blowfish-cbc,cast128-
cbc,arcfour,aes192-cbc,aes256-cbc,rijndael-cbc@xxxxxxxxxxxxxx
debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,hmac-ripemd160,hmac-
ripemd160@xxxxxxxxxxx,hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,hmac-ripemd160,hmac-
ripemd160@xxxxxxxxxxx,hmac-sha1-96,hmac-md5-96
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 sent
debug1: expecting SSH2_MSG_KEX_DH_GEX_GROUP
debug2: dh_gen_key: priv key bits set: 136/256
debug2: bits set: 475/1024
debug1: SSH2_MSG_KEX_DH_GEX_INIT sent
debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY
debug3: check_host_in_hostfile: filename /usr/user1/.ssh/known_hosts
debug3: check_host_in_hostfile: match line 4
debug3: check_host_in_hostfile: filename /usr/user1/.ssh/known_hosts
debug3: check_host_in_hostfile: match line 4
debug1: Host 'solaris2' is known and matches the RSA host key.
debug1: Found key in /usr/user1/.ssh/known_hosts:4
debug2: bits set: 509/1024
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
debug1: Authentications that can continue: publickey,password,keyboard-
interactive
debug3: start over, passed a different list
publickey,password,keyboard-interactive
debug3: preferred publickey,keyboard-interactive,password
debug3: authmethod_lookup publickey
debug3: remaining preferred: keyboard-interactive,password
debug3: authmethod_is_enabled publickey
debug1: Next authentication method: publickey
debug1: Offering public key: /usr/user1/.ssh/nc.id_dsa
debug3: send_pubkey_test
debug2: we sent a publickey packet, wait for reply
debug1: Authentications that can continue: publickey,password,keyboard-
interactive
debug2: we did not send a packet, disable method
debug3: authmethod_lookup keyboard-interactive
debug3: remaining preferred: password
debug3: authmethod_is_enabled keyboard-interactive
debug1: Next authentication method: keyboard-interactive
debug2: userauth_kbdint
debug2: we sent a keyboard-interactive packet, wait for reply
debug1: Authentications that can continue: publickey,password,keyboard-
interactive
debug3: userauth_kbdint: disable: no info_req_seen
debug2: we did not send a packet, disable method
debug3: authmethod_lookup password
debug3: remaining preferred:
debug3: authmethod_is_enabled password
debug1: Next authentication method: password

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