I'm not sure what you mean by "block the ... connection externally"?

Anyway, WinSCP has SSL 3.0 disabled by default since 5.6.2.
In earlier versions you have to disable it manually in session settings:
https://winscp.net/eng/docs/ui_login_tls

As SSL 3.0 is a major vulnerability, could you please provide information on how to block the SSL 3.0 connection externally to WinScp? My client would like for the tool to only use a TLS 1.0, 1.1 and 1.2 connection.

We currently have both a TLS and SSL connection externally to the application, however, we need to remove the SSL 3.0 connection and only use TLS to remediate the vulnerability.

It is suspected that SSL 3.0 is disabled by default, but could you provide instruction on how to disbale SSL 3.0 manually?

Version of WinSCP: 5.5.6

Version of Microsoft Windows: Windows 2008 (64-bit)

Transfer Protocol: FTP

Thank you.

Matthew