====== Connection closed message when using scp among various releases of Slackware Linux ======
 

If your ''scp'' fails with a ''Connection closed'' message, then add a ''-v'' to your options,

<code>
scp -p -v myfile.txt user@host:/home/user/Downloads/
</code>

to see if you get something like the following:

<code>
debug1: Sending subsystem: sftp
debug1: client_global_hostkeys_private_confirm: server used untrusted RSA signature algorithm ssh-rsa for key 0, disregarding
debug1: update_known_hosts: known hosts file /home/xmas/.ssh/known_hosts2 does not exist
Connection closed
</code>
 
If you see the ''Sending subsystem: sftp'' message, then there is a discrepancy between your versions of ''ssh.'' Until you get them all up to the same level, where they are using ''sftp,'' add ''-O'' (dash Oh) to your ''scp'' options to override and use the old way of transfer. You can find more information on ''-O'' in your system's man pages.

<code>
     -O      Use the original SCP protocol for file transfers instead of the
             SFTP protocol.  Forcing the use of the SCP protocol may be neces-
             sary for servers that do not implement SFTP, for backwards-com-
             patibility for particular filename wildcard patterns and for ex-
             panding paths with a '~' prefix for older SFTP servers.  This
             mode is the default.
</code>

====== Sources ======
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  * Originally written by [[wiki:user:xmassecond| Mark A. Stevens]] 2024/12/14 \\
  * man scp

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{{tag>howtos copy ssh scp}}