Hi all, My first post to this list....after googling the web to find the solution. I have 2 box. One running Redhat (OpenSSH_3.9p1, OpenSSL 0.9.7a Feb 19 2003) and other Ubuntu(OpenSSH_4.6p1 Debian-5build1, OpenSSL 0.9.8e 23 Feb 2007). I am trying to do password less login _from_ redhat _to_ ubuntu box. It works for different user ID, but not for same user id. i.e If user_A@redhat ssh's to user_B@ubuntu, it works. But when, user_A@redhat ssh'd to user_A@ubuntu, it doesn't work. PS: Home directory is common across box. (NIS ID's) ---log --- $ ssh-keygen -t rsa Generating public/private rsa key pair. Enter file in which to save the key (/home/dilipm/.ssh/id_rsa): Enter passphrase (empty for no passphrase): Enter same passphrase again: Your identification has been saved in /home/dilipm/.ssh/id_rsa. Your public key has been saved in /home/dilipm/.ssh/id_rsa.pub. The key fingerprint is: d4:db:36:3a:dd:9e:6d:c0:31:4a:75:d9:b9:9d:9d:c2 dilipm@blrmputest1 $cat id_rsa.pub >> authorized_keys $ ssh -vv dilipm@xxxxxxxxxxxxxx OpenSSH_3.9p1, OpenSSL 0.9.7a Feb 19 2003 debug1: Reading configuration data /home/dilipm/.ssh/config debug1: Reading configuration data /etc/ssh/ssh_config debug1: Applying options for * debug2: ssh_connect: needpriv 0 debug1: Connecting to 138.198.188.26 [138.198.188.26] port 22. debug1: Connection established. debug1: identity file /home/dilipm/.ssh/identity type -1 debug2: key_type_from_name: unknown key type '-----BEGIN' debug2: key_type_from_name: unknown key type '-----END' debug1: identity file /home/dilipm/.ssh/id_rsa type 1 debug1: identity file /home/dilipm/.ssh/id_dsa type -1 debug1: Remote protocol version 2.0, remote software version OpenSSH_4.6p1 Debian-5build1 debug1: match: OpenSSH_4.6p1 Debian-5build1 pat OpenSSH* debug1: Enabling compatibility mode for protocol 2.0 debug1: Local version string SSH-2.0-OpenSSH_3.9p1 debug2: fd 3 setting O_NONBLOCK debug1: SSH2_MSG_KEXINIT sent debug1: SSH2_MSG_KEXINIT received debug2: kex_parse_kexinit: diffie-hellman-group-exchange-sha1,diffie-hellman-group14-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,aes128-ctr,aes192-ctr,aes256-ctr debug2: kex_parse_kexinit: aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,arcfour,aes192-cbc,aes256-cbc,rijndael-cbc@xxxxxxxxxxxxxx,aes128-ctr,aes192-ctr,aes256-ctr 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-sha256,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-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,arcfour128,arcfour256,arcfour,aes192-cbc,aes256-cbc,rijndael-cbc@xxxxxxxxxxxxxx,aes128-ctr,aes192-ctr,aes256-ctr debug2: kex_parse_kexinit: aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,arcfour128,arcfour256,arcfour,aes192-cbc,aes256-cbc,rijndael-cbc@xxxxxxxxxxxxxx,aes128-ctr,aes192-ctr,aes256-ctr 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@xxxxxxxxxxx debug2: kex_parse_kexinit: none,zlib@xxxxxxxxxxx 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: 129/256 debug2: bits set: 480/1024 debug1: SSH2_MSG_KEX_DH_GEX_INIT sent debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY debug1: Host '138.198.188.26' is known and matches the RSA host key. debug1: Found key in /home/dilipm/.ssh/known_hosts:1 debug2: bits set: 498/1024 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/dilipm/.ssh/identity ((nil)) debug2: key: /home/dilipm/.ssh/id_rsa (0x9235e80) debug2: key: /home/dilipm/.ssh/id_dsa ((nil)) debug1: Authentications that can continue: publickey,password debug1: Next authentication method: publickey debug1: Trying private key: /home/dilipm/.ssh/identity debug1: Offering public key: /home/dilipm/.ssh/id_rsa debug2: we sent a publickey packet, wait for reply debug1: Authentications that can continue: publickey,password debug1: Trying private key: /home/dilipm/.ssh/id_dsa debug2: we did not send a packet, disable method debug1: Next authentication method: password dilipm@xxxxxxxxxxxxxx's password: --log--- I tried copying the public key to other users authorized key, it works. Problem is If I want to login as a same user. -- Dilip -- Dilip