$ ssh -YvC server1 OpenSSH_4.6p1 Debian-5ubuntu0.1, OpenSSL 0.9.8e 23 Feb 2007 debug1: Reading configuration data /home/daniel/.ssh/config debug1: Applying options for server1 debug1: Reading configuration data /etc/ssh/ssh_config debug1: Applying options for * debug1: Connecting to localhost [127.0.0.1] port 44444. debug1: Connection established. debug1: identity file /home/daniel/.ssh/identity type -1 debug1: identity file /home/daniel/.ssh/id_rsa type 1 debug1: identity file /home/daniel/.ssh/id_dsa type -1 debug1: Remote protocol version 2.0, remote software version OpenSSH_4.2p1 Debian-7ubuntu3 debug1: match: OpenSSH_4.2p1 Debian-7ubuntu3 pat OpenSSH* debug1: Enabling compatibility mode for protocol 2.0 debug1: Local version string SSH-2.0-OpenSSH_4.6p1 Debian-5ubuntu0.1 debug1: SSH2_MSG_KEXINIT sent debug1: SSH2_MSG_KEXINIT received debug1: kex: server->client aes128-cbc hmac-md5 zlib@openssh.com debug1: kex: client->server aes128-cbc hmac-md5 zlib@openssh.com 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: Forcing accepting of host key for loopback/localhost. 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,password debug1: Next authentication method: publickey debug1: Offering public key: /home/daniel/.ssh/id_rsa debug1: Server accepts key: pkalg ssh-rsa blen 277 debug1: Enabling compression at level 6. debug1: Authentication succeeded (publickey). debug1: channel 0: new [client-session] debug1: Entering interactive session. debug1: Requesting X11 forwarding with authentication spoofing. debug1: Sending environment. debug1: Sending env LANG = de_DE.UTF-8 The programs included with the Ubuntu system are free software; the exact distribution terms for each program are described in the individual files in /usr/share/doc/*/copyright. Ubuntu comes with ABSOLUTELY NO WARRANTY, to the extent permitted by applicable law. root@ltsp:~# echo $DISPLAY root@ltsp:~#