Hello, I have a seemingly intractable problem with passwordless logon. I can ssh with no password from hostA to hostB. But I cannot go from hostB to hostA. When I am on hostB, this is the output from ssh -vvv hostA: [dev@hostB .ssh]$ ssh -vvv hostA OpenSSH_3.6.1p2, SSH protocols 1.5/2.0, OpenSSL 0x0090701f debug1: Reading configuration data /home/dev/.ssh/config debug1: Applying options for * debug1: Reading configuration data /etc/ssh/ssh_config debug1: Applying options for * debug1: Rhosts Authentication disabled, originating port will not be trusted. debug2: ssh_connect: needpriv 0 debug1: Connecting to hostA [a.b.c.d] port 22. debug1: Connection established. debug1: identity file /home/dev/.ssh/identity type -1 debug1: identity file /home/dev/.ssh/id_rsa type -1 debug3: Not a RSA1 key file /home/dev/.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 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 /home/dev/.ssh/id_dsa type 2 debug1: Remote protocol version 1.99, remote software version OpenSSH_3.9p1 debug1: match: OpenSSH_3.9p1 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-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: 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: 139/256 debug2: bits set: 1059/2048 debug1: SSH2_MSG_KEX_DH_GEX_INIT sent debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY debug3: check_host_in_hostfile: filename /home/dev/.ssh/known_hosts debug3: check_host_in_hostfile: filename /etc/ssh/ssh_known_hosts debug3: check_host_in_hostfile: filename /home/dev/.ssh/known_hosts debug3: check_host_in_hostfile: filename /etc/ssh/ssh_known_hosts debug3: check_host_in_hostfile: filename /home/dev/.ssh/known_hosts debug3: check_host_in_hostfile: filename /etc/ssh/ssh_known_hosts debug2: no key of type 0 for host hostA debug3: check_host_in_hostfile: filename /home/dev/.ssh/known_hosts2 debug3: check_host_in_hostfile: filename /etc/ssh/ssh_known_hosts2 debug3: check_host_in_hostfile: filename /home/dev/.ssh/known_hosts debug3: check_host_in_hostfile: filename /etc/ssh/ssh_known_hosts debug2: no key of type 2 for host hostA Host key verification failed. debug1: Calling cleanup 0x8062c30(0x0) The public key for hostA is in the known_hosts file of hostB. Here are the uncommented lines only from sshd_config on hostA, which is the same as the file from hostB SyslogFacility AUTHPRIV X11Forwarding yes Subsystem sftp /usr/libexec/openssh/sftp-server Here is the directory listing on hostB -rw------- 1 dev shop 1678 Oct 21 18:06 authorized_keys -rw------- 1 dev shop 840 May 29 09:40 authorized_keys.orig -rw------- 1 dev shop 1160 Apr 10 2007 config -rw------- 1 dev shop 668 Apr 14 2004 id_dsa -rw-r--r-- 1 dev shop 610 Apr 13 2004 id_dsa.pub -rw------- 1 dev shop 159603 Nov 17 18:08 known_hosts -rw-r--r-- 1 root root 104146 Jun 22 2005 known_hosts.062205 -rw-r--r-- 1 root root 116023 Jan 10 2008 known_hosts.bak Here it is on hostA -rw------- 1 dev dev 3615 Nov 17 17:36 authorized_keys -rw------- 2 dev dev 668 Nov 14 2007 id_dsa -rw-r--r-- 1 dev dev 609 Nov 14 2007 id_dsa.pub -rw-r--r-- 1 dev dev 609 Nov 17 17:43 id_dsa.pub.orig -rw------- 2 dev dev 668 Nov 14 2007 identity -rw------- 1 dev dev 887 Nov 14 2007 id_rsa -rw-r--r-- 1 dev dev 229 Nov 14 2007 id_rsa.pub -rw------- 1 dev dev 7289 Oct 29 11:54 known_hosts What am I missing? Thanks for your help. Chris
