ssh "Permission denied (publickey)"

m4rtin · 11-25-2010, 04:22 AM

If I try to connect to 192.168.1.100 server, I get:

Code:

martin@desktop:~> ssh -v 192.168.1.100
OpenSSH_4.1p1, OpenSSL 0.9.7g 11 Apr 2005
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: Applying options for *
debug1: Connecting to 192.168.1.100 [192.168.1.100] port 22.
debug1: Connection established.
debug1: identity file /home/martin/.ssh/identity type 0
debug1: identity file /home/martin/.ssh/id_rsa type 1
debug1: identity file /home/martin/.ssh/id_dsa type -1
debug1: Remote protocol version 1.99, remote software version OpenSSH_3.5p1
debug1: match: OpenSSH_3.5p1 pat OpenSSH_3.*
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_4.1
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 '192.168.1.100' is known and matches the RSA host key.
debug1: Found key in /home/martin/.ssh/known_hosts:23
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
debug1: Next authentication method: publickey
debug1: Offering public key: /home/martin/.ssh/id_rsa
debug1: Authentications that can continue: publickey
debug1: Trying private key: /home/martin/.ssh/id_dsa
debug1: No more authentication methods to try.
Permission denied (publickey).

Unfortunately, I don't manage this 192.168.1.100 server. Am I correct, that sshd on 192.168.1.100 supports only publickey authentication because:

Code:

debug1: Authentications that can continue: publickey

I have .ssh/id_rsa present. Any ideas, what might cause this "Permission denied (publickey)" issue?

linuxlover.chaitanya · 11-25-2010, 04:24 AM

Have you generated the public and private ssh key pair for your system? If the server is configured to use public key authentication, you will need to take your public key and place it on the server on the configured location.

wpeckham · 11-25-2010, 06:55 AM

If you have no direct access to this server, you wil have to provide your public key to the SYSADM staff that HAS access and ask them to install it so that you can access the account. While there, they should check the ownership and permissions of the account home, ~/.ssh folder, and files in ~/.ssh. If the permissions are wrong, ssh will refuse the connections: but the error generated is very clear about WHY and we are not seeing that.

To answer that question: yes it does appear that the server is set to allow access by secure key only.