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SSL/TLS Tab (FTP Options)

Getting there (FTP Client)

The Secure Sockets Layer protocol (SSL) and its compatible successor, the Transport Layer Security protocol (TLS), enable a client and server to establish a secure, encrypted connection over a public network. When you connect using SSL/TLS, the client authenticates the server before making a connection, and all data passed between Reflection and the server is encrypted. Depending on the server configuration, the server may also authenticate the client.

The options are:


Use SSL/TLS Security

Enables SSL/TLS connections. You must select this before you can set other values on the SSL/TLS tab. When Use SSL/TLS security is selected, Reflection will only connect to the host if a secure SSL/TLS connection can be established.

Before making an SSL/TLS connection, Reflection must authenticate the host. Authentication is handled through the use of digital certificates. These certificates are part of the same Public Key Infrastructure (PKI) that is used to secure internet transactions. Your computer must be configured to recognize the digital certificate presented by your host and, if necessary, to provide a certificate for client authentication. If your computer is not properly configured, or if the certificates presented for authentication are not valid, you will not be able to make SSL/TLS connections. Depending on how a host certificate was issued, you may need to install a certificate on your local computer.


Configure PKI

Opens the PKI Configuration dialog box, which you can use to configure PKI settings for Reflection SSL/TLS sessions.


Encryption Strength

Specify the desired level of encryption for SSL/TLS connections. The connection will fail if this level cannot be provided.

If you select Default, any encryption level is permitted, and Reflection will negotiate with the host system to choose the strongest encryption level supported by both the host and the client. If you are running in FIPS mode and select Default, Reflection will negotiate using only FIPS compliant encryption levels.


Encrypt Data Stream

Specifies whether or not data is encrypted when the FTP client is configured to use SSL/TLS encryption.When this checkbox is selected, all communication between the your computer and the FTP server is encrypted. When this checkbox is cleared, the FTP command channel (which is used for all FTP commands, including your user name and password) is encrypted. However, the data channel (which is used for directory listings and the contents of the files you transfer) is not encrypted.


Clear command channel

When this is enabled, FTP Client sends a CCC command to the host. If the host supports this option, this turns off encryption for the command channel only.


SSL/TLS version

Specifies which SSL or TLS version to use. TLS Version 1.0 is the newer protocol and is used by default.


Retrieve and validate certificate chain

Specifies whether certificates presented for host authentication are checked to determine if they are valid and signed by a trusted CA.

Caution: Clearing this setting creates a security risk by allowing host authentication with unvalidated certificates.


Note:Certificate validation is required when SSL/TLS version is set to TLS Version 1.0 (the newer protocol and the default). To clear this setting (which disables certificate validation), you must set SSL/TLS version to SSL Version 3.0.


Implicit SSL/TLS connection

By default the FTP Client makes SSL/TLS connections using Explicit security. In order to establish the SSL connection, explicit security requires that the FTP client issue a specific command (AUTH TLS) to the FTP server after establishing a connection. If the server gives a success response, the client begins the TLS negotiation. The default FTP server port (21) is used.

When you select Implicit SSL/TLS Connection, the Reflection FTP Client uses Implicit security. Implicit security automatically begins with an SSL connection as soon as the FTP client connects to the server; no AUTH TLS command is sent prior to the TLS negotiation.

By default, the Reflection FTP Client uses port 990 for Implicit connections.


Connect through a NAT server

Select this setting if your FTP Client connects through a NAT (Network Address Translation) server. When this setting is selected, the FTP Client ignores IP addresses in FTP commands returned from the server.


Run in FIPS Mode

When you run in FIPS mode, all connections are made using security protocols and algorithms that meet FIPS 140-2 standards. In this mode some standard connection options are not available. A FIPS mode icon is visible on the status bar when a connection is made using FIPS mode.

Note: Selecting Run in FIPS mode on the SSL/TLS tab enforces FIPS mode only for the connection currently being configured. Administrators can use Reflection Group Policies to enforce FIPS mode for all Reflection connections.

Reflection Security Proxy Server Settings

When Use Reflection security proxy is enabled, Reflection connects to your host via the Reflection for the Web security proxy. You can use this proxy to configure secure connections even if your host is not running an SSL/TLS-enabled Telnet server. To support such connections, you must install and configure the proxy server and provide a server certificate on all workstations that will be connecting through the server. Use Security Proxy to specify the host running the Reflection for the Web security proxy. Use Proxy port to specify the port that the Reflection proxy server is listening on.


  • When the security proxy is used, the connection between the client and the proxy server is secured and encrypted using the SSL/TLS protocol, but information sent between the proxy server and the destination is in the clear.
  • If you configure sessions that connect through a Reflection for the Web proxy server with authorization enabled, users must log onto the Reflection for the Web server before they can connect using these sessions.

Related Topics

Which Protocols Can I Use?

Digital Certificates in SSL/TLS Sessions