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TLS/SSL Page (Advanced Site Settings Dialog)
The TLS/SSL page on the Advanced Site Settings dialog allows you to configure options of TLS/SSL protocols for FTPS.
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This feature is available only in the latest beta release.
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To reveal this page you need to select FTP file protocol and enable Encryption on Login dialog.
TLS/SSL Options
Using Minimum and Maximum TLS/SSL version selections, you can restrict what versions of TLS/SSL is WinSCP allowed to use.
You may want to restrict minimum TLS/SSL version, particularly in order to prevent WinSCP from using old versions of TLS/SSL protocols that suffer form known vulnerabilities (SSL 2.0 in particular, but also SSL 3.0 and TLS 1.0).
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You may want to restrict maximum TLS/SSL version, when there is an interoperability problem with your FTPS server. Particularly TLS 1.1 and TLS 1.2 are new and some servers to not implement them correctly.
Uncheck Reuse TLS/SSL session ID for data connections, when there is an interoperability problem with your FTPS server when reusing the TLS/SSL session ID.
Further Reading
Read more about Login dialog and Advanced Site Settings dialog.