I can't connect circleci with shh to my server

I’m trying to connect circleci to the server using ssh but I can’t do it, at first glance I seem to have managed to follow the circleci documentation.

I get the following output:

OpenSSH_6.6.1, OpenSSL 1.0.1f 6 Jan 2014

debug1: Reading configuration data /etc/ssh/ssh_config

debug1: /etc/ssh/ssh_config line 1: Applying options for *

debug2: ssh_connect: needpriv 0

debug1: Connecting to xx.xx.xx.xx [xx.xx.xx.xx] port 22.

debug1: Connection established.

debug1: identity file /home/circleci/.ssh/id_rsa type -1

debug1: identity file /home/circleci/.ssh/id_rsa-cert type -1

debug1: identity file /home/circleci/.ssh/id_dsa type -1

debug1: identity file /home/circleci/.ssh/id_dsa-cert type -1

debug1: identity file /home/circleci/.ssh/id_ecdsa type -1

debug1: identity file /home/circleci/.ssh/id_ecdsa-cert type -1

debug1: identity file /home/circleci/.ssh/id_ed25519 type -1

debug1: identity file /home/circleci/.ssh/id_ed25519-cert type -1

debug1: Enabling compatibility mode for protocol 2.0

debug1: Local version string SSH-2.0-OpenSSH_6.6.1p1 Ubuntu-2ubuntu2.13

debug1: Remote protocol version 2.0, remote software version OpenSSH_7.2p2 Ubuntu-4ubuntu2.8

debug1: match: OpenSSH_7.2p2 Ubuntu-4ubuntu2.8 pat OpenSSH* compat 0x04000000

debug2: fd 3 setting O_NONBLOCK

debug1: SSH2_MSG_KEXINIT sent

debug1: SSH2_MSG_KEXINIT received

debug2: kex_parse_kexinit: curve25519-sha256@libssh.org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1

debug2: kex_parse_kexinit: ecdsa-sha2-nistp256-cert-v01@openssh.com,ecdsa-sha2-nistp384-cert-v01@openssh.com,ecdsa-sha2-nistp521-cert-v01@openssh.com,ssh-ed25519-cert-v01@openssh.com,ssh-rsa-cert-v01@openssh.com,ssh-dss-cert-v01@openssh.com,ssh-rsa-cert-v00@openssh.com,ssh-dss-cert-v00@openssh.com,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,ssh-ed25519,ssh-rsa,ssh-dss

debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-gcm@openssh.com,aes256-gcm@openssh.com,chacha20-poly1305@openssh.com,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,rijndael-cbc@lysator.liu.se

debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-gcm@openssh.com,aes256-gcm@openssh.com,chacha20-poly1305@openssh.com,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,rijndael-cbc@lysator.liu.se

debug2: kex_parse_kexinit: hmac-md5-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-ripemd160-etm@openssh.com,hmac-sha1-96-etm@openssh.com,hmac-md5-96-etm@openssh.com,hmac-md5,hmac-sha1,umac-64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-ripemd160,hmac-ripemd160@openssh.com,hmac-sha1-96,hmac-md5-96

debug2: kex_parse_kexinit: hmac-md5-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-ripemd160-etm@openssh.com,hmac-sha1-96-etm@openssh.com,hmac-md5-96-etm@openssh.com,hmac-md5,hmac-sha1,umac-64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-ripemd160,hmac-ripemd160@openssh.com,hmac-sha1-96,hmac-md5-96

debug2: kex_parse_kexinit: none,zlib@openssh.com,zlib

debug2: kex_parse_kexinit: none,zlib@openssh.com,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: curve25519-sha256@libssh.org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group14-sha1

debug2: kex_parse_kexinit: ssh-rsa,rsa-sha2-512,rsa-sha2-256,ecdsa-sha2-nistp256,ssh-ed25519

debug2: kex_parse_kexinit: chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com

debug2: kex_parse_kexinit: chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com

debug2: kex_parse_kexinit: umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1

debug2: kex_parse_kexinit: umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1

debug2: kex_parse_kexinit: none,zlib@openssh.com

debug2: kex_parse_kexinit: none,zlib@openssh.com

debug2: kex_parse_kexinit:

debug2: kex_parse_kexinit:

debug2: kex_parse_kexinit: first_kex_follows 0

debug2: kex_parse_kexinit: reserved 0

debug2: mac_setup: setup hmac-sha1-etm@openssh.com

debug1: kex: server->client aes128-ctr hmac-sha1-etm@openssh.com none

debug2: mac_setup: setup hmac-sha1-etm@openssh.com

debug1: kex: client->server aes128-ctr hmac-sha1-etm@openssh.com none

debug1: sending SSH2_MSG_KEX_ECDH_INIT

debug1: expecting SSH2_MSG_KEX_ECDH_REPLY

debug1: Server host key: ECDSA xx:xx:xx:xx:xx:xx:xx:xx:xx

Warning: Permanently added ‘xx.xx.xx.xx’ (ECDSA) to the list of known hosts.

debug1: ssh_ecdsa_verify: signature correct

debug2: kex_derive_keys

debug2: set_newkeys: mode 1

debug1: SSH2_MSG_NEWKEYS sent

debug1: expecting SSH2_MSG_NEWKEYS

debug1: SSH2_MSG_NEWKEYS received

debug2: set_newkeys: mode 0

debug1: SSH2_MSG_SERVICE_REQUEST sent

debug2: service_accept: ssh-userauth

debug1: SSH2_MSG_SERVICE_ACCEPT received

debug2: key: (0x561e660e6600),

debug2: key: (0x561e660e6780),

debug2: key: /home/circleci/.ssh/id_rsa ((nil)),

debug2: key: /home/circleci/.ssh/id_dsa ((nil)),

debug2: key: /home/circleci/.ssh/id_ecdsa ((nil)),

debug2: key: /home/circleci/.ssh/id_ed25519 ((nil)),

debug1: Authentications that can continue: publickey

debug3: start over, passed a different list publickey

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 RSA public key:

debug3: send_pubkey_test

debug2: we sent a publickey packet, wait for reply

debug1: Authentications that can continue: publickey

debug1: Offering RSA public key:

debug3: send_pubkey_test

debug2: we sent a publickey packet, wait for reply

debug1: Authentications that can continue: publickey

debug1: Trying private key: /home/circleci/.ssh/id_rsa

debug3: no such identity: /home/circleci/.ssh/id_rsa: No such file or directory

debug1: Trying private key: /home/circleci/.ssh/id_dsa

debug3: no such identity: /home/circleci/.ssh/id_dsa: No such file or directory

debug1: Trying private key: /home/circleci/.ssh/id_ecdsa

debug3: no such identity: /home/circleci/.ssh/id_ecdsa: No such file or directory

debug1: Trying private key: /home/circleci/.ssh/id_ed25519

debug3: no such identity: /home/circleci/.ssh/id_ed25519: No such file or directory

debug2: we did not send a packet, disable method

debug1: No more authentication methods to try.

Permission denied (publickey).

Exited with code 255