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=== Download file from remote (host2) to local (host1) host1:~$ scp root@host2:filename filename root@host2's password: select: Bad file descriptor === Upload file from remote (host2) to local (host1) [root@host2 /root]# scp filename user@host1:filename Host key not found from database. Key fingerprint: xirog-pekeg-baluv-modan-gyhuf-padib-nahyb-zanys-bysez-fymol-kaxax You can get a public key's fingerprint by running % ssh-keygen -F publickey.pub on the keyfile. Are you sure you want to continue connecting (yes/no)? y Host key saved to /root/.ssh2/hostkeys/key_22_host1.pub host key for host1, accepted by root Tue Oct 17 2000 11:10:06 -0600 user@host1's password: es === And after this `es' on last line I see no activity and press Ctrl-C === Than I try to UPLOAD file I see at /var/log/messages this: 22:08:09 sshd 2715: Could not reverse map address XXX.XXX.XXX.X. 22:08:09 sshd 2715: Accepted password for user from XXX.XXX.XXX.X port 1035 ssh$ 22:08:11 sshd 2715: subsystem request for sftp 22:08:11 sshd 2715: subsystem request for sftp failed, subsystem not found === real host names, user names and ip addreses changed to host1, host2, === user, XXX.XXX.XXX.X Remote host SSH version is: ssh: SSH Secure Shell 2.2.0 (non-commercial version) on i686-pc-linux-gnu Local host SSH version is: SSH Version OpenSSH_2.2.0p1, protocol versions 1.5/2.0. Compiled with SSL (0x0090581f).
Have you tried SSH 2.3.0? It has better license too. Also, it might be that scp tries to use sftp. Try disabling sftp-server.
From the OpenSSH FAQ List: 4.OpenSSH does not implement the SFTP subsystem. While the SSH protocol is specified in the IETF SECSH drafts, the SFTP subsystem found in some commercial SSH implementations is not part of these official SSH protocol specifications. It is a proprietary protocol invented by SSH Communications Security Corp. It could be reverse engineered, but we have not yet invested efforts to do so. UPDATE: Markus Friedl has spent some time and reverse engineered the protocol. The next release after 2.2.0 will contain an sftp-server implementation.
Yes, sftp-server support was added in post-2.2.0p1 builds. However, you could still use sftp-server binary from SSH.COM's ssh2 on the system before that. And even if not used, uncommenting the dreadful line in /etc/ssh/sshd_config might cause interesting problems..
Newer versions of OpenSSH have better compability support with SSH.COM products, plus there's sftp-server.