3Com 4200G 12-Port Configuration Manual page 518

Opening an SSH connection with password
authentication
Opening an SSH connection with publickey
authentication
For putty, it is recommended to use PuTTY release 0.53; PuTTY release 0.58 is also supported.
For OpenSSH, it is recommended to use OpenSSH_3.1p1; OpenSSH_4.2p1 is also supported.
Any other version or other client, please be careful to use.
Selecting the protocol for remote connection as SSH. Usually, a client can use a variety of remote
connection protocols, such as Telnet, Rlogin, and SSH. To establish an SSH connection, you must
select SSH
Selecting the SSH version. Since the device supports SSH2.0 now, select 2.0 or lower for the
client.
Specifying the private key file. On the server, if public key authentication is enabled for an SSH
user and a public key is set for the user, the private key file corresponding to the public key must be
specified on the client. RSA key pairs and DSA key pairs are generated by a tool of the client
software.
The following takes the client software of PuTTY Version 0.58 as an example to illustrate how to
configure the SSH client:
Generating a client key
To generate a client key, run PuTTYGen.exe, and select from the Parameters area the type of key you
want to generate, either SSH-2 RSA or SSH-2 DSA, then click Generate.
Task
1-15
Remarks
Required for password authentication;
unnecessary for publickey authentication
Required for publickey authentication;
unnecessary for password authentication