This command is only for FTPS connections (FTP over TLS/SSL). When the connection is encrypted, the FTP server provides its certificate to prove its identity. You can use this command or click the lock icon in the Directory line to show this certificate.
The plugin uses the same certificate stores and validity verification algorithms as Internet Explorer. All trusted certificates can be viewed in the Internet Options Control Panel.
To show certificate:
|Menu:||Plugins/FTP Client/Show Certificate|
|Context menu:||Right-click in panel and select Show Certificate.|