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scp Executing ssh1 in compatibility mode failed

Posted by zeal on 2012-12-27 15:03 , 2089 characters , Via |  + 0 - 0   English
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scp: warning: Executing scp1.
scp: FATAL: Executing ssh1 in compatibility mode failed (Check that scp1 is in your PATH).

原因是scp的客户端与服务器端所用的版本不同。最简单的方法是用sftp命令来替代(不过sftp的-P参数不是用来设置ssh端口的,要连接非标准端口服务器的最好统一使用 -o Port=XXXX 参数来设置)。

Quote 1:

This problem is often quite perplexing, since a ssh -V trace may show that you're using SSH-2 - so what is a message about "ssh1 compatibility mode " doing in there?

What's happening is this:

  1. On the OpenSSH client, you run say, scp foo server:bar
  2. scp runs ssh in a subprocess to connnect to the server, and run the remote command scp -t bar. This is intend to start an instance of the scp program on the server, and the two scp's will cooperate by speaking over the SSH connection, to retrieve the file.
  3. ssh connects to the server (using either protocol 1 or 2, it doesn't matter), and runs the remote scp command. However, the "scp" that gets run on the server is the SSH2 scp program (scp2), not the OpenSSH one. The crux of the problem is: besides the name, these two scp's have exactly nothing in common. scp2 cannot speak the file-transfer protocol that OpenSSH scp does. However, scp2 recognizes from the "-t" flag what's expected, and tries exec scp1 to service the connection (this is the extent of SSH2's SSH-1 compatibility; where OpenSSH has code for both protocols in a single set of programs, SSH2 expects to execute programs from a parallel SSH1 installation). It fails (presumably because you don't have SSH1 installed), and reports the problem.

The solution is to install either the OpenSSH or SSH1 version of scp on the server under the name "scp1", somewhere in the sshd2's PATH.

Quote 2:

OpenSSH implements "scp" via RCP over an SSH channel.
ssh.com implement "scp" via FTP over an SSH channel.

OpenSSH's server has both implementations, but it's client only uses the RCP version.

So if the client is OpenSSH, use "sftp" to get to an ssh.com server.

Last Modified on 2014-02-19 09:46
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