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Technical Tip: Modify the TLS version for the FortiGate GUI access

Description

This article describes how to change the TLS version via CLI when accessing the GUI.

Scope

FortiGate.

Solution

By default, TLS 1.1 and TLS 1.2 are enabled when accessing to the FortiGate GUI via a web browser.

To verify what version is enabled:

config system global

show full-config | grep 'min-proto'

end

The output screenshot below is an example from version 7.2.8 firmware:

if VDOMs are enabled, enter this again:

config system global

get | grep 'min-proto'

To change this setting from the CLI:

config system global
set admin-https-ssl-versions (shift + ?) <- To list the available TLS version.

tlsv1-0 TLS 1.0.
tlsv1-1 TLS 1.1.
tlsv1-2 TLS 1.2.
set admin-https-ssl-versions tlsv1-2 <- With this setting, only TLS 1.2 is allowed.

end

From v6.4, tlsv1-0 is no longer supported and instead, tlsv1-3 was introduced:

config system global

set admin-https-ssl-versions
tlsv1-1 TLS 1.1.
tlsv1-2 TLS 1.2.
tlsv1-3 TLS 1.3.

TLS 1.3 is not available in Low-Encryption(LENC) FortiGates.

Related documents:

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