Secure Computing: Configuring File Transfers for SSH Protocol 2
Windows
SecureFX
SecureFX only uses SSH protocol 2 by default. No configuration is required. While the SecureFX documentation describes a way to connect to an SSH1 server, we strongly recommend against it due to the security problems inherent in SSH1 and the fact that only your password (not your data) will be encrypted.
VCP (SecureCRT)
VCP only uses SSH protocol 2 by default. No configuration is required.
Macintosh
MacSFTP
MacSFTP will negotiate an SSH2 connection if possible, but will fall back to SSH1 otherwise. To prevent making SSH1 connections, click the pulldown "triangle" in the Login panel and select "SSH2" as the protocol instead of "Automatic".
Unix/MacOS X
SCP/SFTP
The command line versions of SCP and SFTP from OpenSSH use the same configuration file. To prevent making connections with protocol 1 for both of these tools, create a file $HOME/.ssh/config containing the line:
Protocol 2