Ok, let us see if this make since. I have three servers that back up nightly to my remote back up site. They all use SSH and authenticate with RSA/DSA keys. Two of the three servers are still connecting to the back up machine just fine but the third suddenly fails. How and why should this happen? I would rather understand why this has happened and how to fix it instead of just setting it up again. Besides, while I remember was easy to set up the keys and get it authenticating, I have long since forgot the details on how to actually do it ;-) Any thoughts as to why it would fail? [backupuser@redcent etc]# ssh -v remoteuser@remote.cornerstonehome.com OpenSSH_3.9p1, OpenSSL 0.9.7a Feb 19 2003 debug1: Reading configuration data /etc/ssh/ssh_config debug1: Applying options for * debug1: Connecting to remote.cornerstonehome.com [remote.cornerstonehome.com] port 22. debug1: Connection established. debug1: permanently_set_uid: 0/0 debug1: identity file /backupuser/.ssh/identity type 0 debug1: identity file /backupuser/.ssh/id_rsa type 1 debug1: identity file /backupuser/.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_3.9p1 debug1: SSH2_MSG_KEXINIT sent debug1: SSH2_MSG_KEXINIT received debug1: kex: server->client aes128-cbc hmac-md5 none 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 debug1: SSH2_MSG_KEX_DH_GEX_INIT sent debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY debug1: Host 'remote.cornerstonehome.com' is known and matches the RSA host key. debug1: Found key in /backupuser/.ssh/known_hosts:4 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: publickey,gssapi-with-mic,password debug1: Next authentication method: publickey debug1: Offering public key: /backupuser/.ssh/id_rsa debug1: Authentications that can continue: publickey,gssapi-with-mic,password debug1: Offering public key: /backupuser/.ssh/id_dsa debug1: Authentications that can continue: publickey,gssapi-with-mic,password debug1: Next authentication method: password remoteuser@remote.cornerstonehome.com's password: Bryan O'Neal Cornerstone Homes & Development, Inc. 4220 E. McDowell Rd Ste. #108 Mesa, AZ 85215 (480) 505-1900 http://www.cornerstonehome.com