Protocol Error Unexpected Newline
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ssh is working but not scp neither sftp) Posted on 06/04/2012 by Sims A quick solution for a problem I encountered : protocol error: unexpected newline I can http://net-admin.fr/protocol-error-unexpected-ssh-is-working-but-not-scp-neither-sftp/ ssh to a host , but I cannot scp, I cannot sftp. https://blogs.oracle.com/janp/entry/how_the_scp_protocol_works The problem was because of my banner, of my bashrc. Check out your banner, which ever shell you are using, if there is a blank line, a line break, it will prevent scp/sftp from working. Or even worse if it has been created on Windows, try using a tofrodos, to protocol error re-format it for Linux. Small part of my ssh debug logs while encoutering the problem : Apr 6 11:36:54 myhost sshd[20625]: debug1: SELinux support disabled Apr 6 11:36:54 myhost sshd[20625]: debug1: PAM: reinitializing credentials Apr 6 11:36:54 myhost sshd[20625]: debug1: permanently_set_uid: 0/0 Apr 6 11:36:54 myhost sshd[20365]: debug1: Received SIGCHLD. Apr 6 11:36:54 myhost sshd[20365]: debug1: session_by_pid: pid 20625 Apr 6 11:36:54 protocol error unexpected myhost sshd[20365]: debug1: session_exit_message: session 0 channel 0 pid 20625 Apr 6 11:36:54 myhost sshd[20365]: debug1: session_exit_message: release channel 0 Apr 6 11:36:54 myhost sshd[20365]: debug1: server_input_channel_req: channel 0 request eow@openssh.com reply 0 Apr 6 11:36:54 myhost sshd[20365]: Received disconnect from 10.0.0.1: 11: disconnected by user Apr 6 11:36:54 myhost sshd[20365]: debug1: do_cleanup Apr 6 11:36:54 myhost sshd[20365]: debug1: PAM: cleanup Apr 6 11:36:54 myhost sshd[20365]: debug1: PAM: closing session Apr 6 11:36:54 myhost sshd[20365]: pam_unix(sshd:session): session closed for user root Apr 6 11:36:54 myhost sshd[20365]: debug1: PAM: deleting credentials Posted in Non classé | « MySQL Create User and give privileges Debian Squeeze SNMP » Leave a comment Cancel reply Your email address will not be published. Required fields are marked * Name * Email * Website Comment You may use these HTML tags and attributes:
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janp on Jul 09, 2007 Have you ever wondered how the scp and rcp commands worked? The first time I did I haven't found any documentation on the subject. There is no RFC, no draft, not even README file describing it. After reading the source code I tried again and realized that old version of rcp.c might be really the only original documentation available. And since I worked on a couple of bugs in our scp(1) some time ago I put a note in my todo list to write something about it, for the next time I'm going to need it. A very short history of the protocol The rcp command appeared in 4.2BSD in 1982, with this manual page. Since then it evolved a little bit which means that old rcp can't work together with current rcp in all cases. The same protocol was used in ssh-1.2.x implementation which was later used as a base for OpenSSH. Since Solaris Secure Shell is a fork of OpenSSH it means that the very same protocol is used in scp(1) in Solaris. Having said all of that I should have probably named this blog entry How the RCP protocol works but it doesn't look cool, you know. If you have more information about the history of the protocol let me know please. How it works I will talk only about scp. As already said, rcp is the same beast with regard to the protocol, it just uses rlogin as a mode of transportation. The synopsis for scp(1) is like this: scp [options] [user@]host1:]file1 []... [ [user@]host2:]file2 In all cases aside from remote-to-remote scenario the scp command processes command line options and then starts an SSH connection to the remote host. Another scp command is run on the remote side through that connection in either source or sink mode. Source mode reads files and sends them over to the other side, sink mode accepts them. Source and sink modes are triggered using -f (from) and -t (to) options,