Home / server / Questions / 438770
In Process
Oh Chin Boon
Asked: 2012-10-16 19:40:09 +0800 CST

Protocol error when trying to SFTP from server to server

  • 772

I am hitting a Protocol error while trying to SFTP from one server to another. I have tried to search up Google to no avail. May i know if anyone can help me with this. 

rel@kingfisher:/kingfisher_bft/hme/rel>  sftp [email protected]
Need basic cursor movement capability, using vt100
error: Could not open connection to `[email protected]': Protocol error
sftp

2 Answers

  1. The machine you are using to sftp into the remote machine seems to be missing the ncurses libraries. Install them with apt-get install libncurses5 or download them from your distributions web-page.

    [ From: http://ftp.vim.org/security/ssh/README.SSH2 ]

    If your sftp2 complains something like this: "Need basic cursor movement capability, using vt100", then no library containing tgetent() function was found when you ran ./configure . If you have a Linux system, then that is probably because you don't have either termcap-devel or ncurses-devel packages installed. If you want to get rid of the message, and/or to use some more exotic terminals capabilities, you should install either package. (A good place to look for those is your distribution's web-page.)

    • 1

  2. SFTP is a subsystem of the SSH protocol, and has its own protocol. Actually there are 7 SFTP protocol versions (from 0 to 6) and 2 SSH protocol versions (SSH-1 and SSH-2).

    What I see here above looks like the client and the server are unable to negotiate a common protocol, and this could be due to several reasons:

  3. the client tries a SSH-2 connection to a server that only supports SSH-1
  4. the client tries a SFTP protocol version that is not supported by the server
  5. unlikely: the client tries to negotiate encryption/MAC algorithms that are unsupported by the server
    6. In any case, I would research for the root cause of this issue on the server side.

  • 0