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(Two-factor authentication available in EFT Server Enterprise) Authenticating with RADIUS/RSA SecurID can be a multi-step process on your first login, as you establish your PIN. The server can request additional information from the user or device, such as a secondary password. The secondary password prompt can cause problems with SFTP clients who may not allow multiple prompts.
For example, in the screenshot:
To successfully complete the PIN change with OpenSSH SFTP client, you have to specify the option:
This option allows multiple password prompts up to the number (N) that you specify.
Refer to the OpenSSH man pages for more information: http://www.manpagez.com/man/5/ssh_config/.