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SSL/TLS

Overview

When SSL/TLS is configured, data is encrypted between the IOLAN and the host/device (which must

also support SSL/TLS). When you configure the

SSL/TLS settings in the System section, you are

configuring the default global SSL/TLS settings; you are not configuring an SSL/TLS server.

Functionality

You can create an encrypted connection using SSL/TLS for the following profiles: TruePort, TCP

Sockets

, Terminal (the user’s Service must be set to SSL_Raw), Serial Tunneling, Virtual Modem,

and

Modbus.

When configuring SSL/TLS, the following configuration options are available:

z You can set up the IOLAN to act as an SSL/TLS client or server.

z There is an extensive selection of SSL/TLS ciphers that you can configure for your SSL/TLS

connection;

Appendix B, SSL/TLS Ciphers for a list of SSL/TLS ciphers.

z You can enable peer certificate validation, for which you must supply the validation criteria that

was used when creating the peer certificate (this is case sensitive).

AES The IOLAN SSH server’s AES encryption is enabled/disabled.

Default: Enabled

Break String The break string used for inband SSH break signal processing. A break signal

is generated on a specific serial port only when the server's break option is

enabled and the user currently connected using reverse SSH has typed the

break string exactly.

Field Format: maximum 8 characters

Default: ~break, where ~ is tilde

Enable Verbose

Output

Displays debug messages on the terminal.

Default: Disabled

Allow Compression Requests compression of all data. Compression is desirable on modem lines

and other slow connections, but will only degrade data trransmission speeds on

faster networks.

Default: Disabled

expires before the login is completed, the session is terminated.

Default: 120 seconds

Values: 1-600 seconds

Note:

Some combinations of cipher groups are not available on FIPS firmware versions.

Note:

See Keys and Certificates for information about SSL/TLS support documents.

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