Disable TLS 1.1 Support

08/22/2023 430 People found this article helpful 493,983 Views

Description

You can disable the support for old and insecure SSL/TLS versions to improve the security of your network.

The SonicWall management interface can now be accessed from a browser using SSLv3, TLS 1.0, TLS 1.1 or TLS 1.2.
The SonicWall SSL-VPN feature can also be accessed using these protocols.
The DPI-SSL feature supports all the protocols above.

Resolution

Resolution for SonicOS 7.X

This release includes significant user interface changes and many new features that are different from the SonicOS 6.5 and earlier firmware. The below resolution is for customers using SonicOS 7.X firmware.

Login to the SonicWall management and then go to diag page through the URL : https://{IP_ADDRESS}/sonicui/7/m/mgmt/settings/diag
EXAMPLE: From dashboard page after login, change the URL at top from https://192.168.168.168/sonicui/7/m/dashboard/overview/status/device to https://192.168.168.168/sonicui/7/m/mgmt/settings/diag
Click Internal Settings.
Search for Enable TLS compatible mode and disable it if enabled.
You can also disable TLS 1.1 from the diag page.

CAUTION: TLS 1.1 is still very used on the web.

Resolution for SonicOS 6.5

This release includes significant user interface changes and many new features that are different from the SonicOS 6.2 and earlier firmware. The below resolution is for customers using SonicOS 6.5 firmware.

Login to the SonicWall management and then replace the word main with the word diag in the URL.
EXAMPLE: https://192.168.168.168/main.html will become https://192.168.168.168/diag.html.
Click Internal Settings.
Search for Enable TLS compatible mode and disable it if enabled.
You can also disable TLS 1.1 from the diag page.
CAUTION: TLS 1.1 is still very used on the web.

Resolution for SonicOS 6.2 and Below

The below resolution is for customers using SonicOS 6.2 and earlier firmware. For firewalls that are generation 6 and newer we suggest to upgrade to the latest general release of SonicOS 6.5 firmware.

Login to the SonicWall management and then replace the word main with the word diag in the URL.

EXAMPLE: https://192.168.168.168/main.html will become https://192.168.168.168/diag.html).
Click Internal Settings.
Search for Enable TLS compatible mode and disable it if enabled.
You can also disable TLS 1.1 from the diag page.
CAUTION: TLS 1.1 is still very used on the web.

NOTE: On Previous firmware versions you can find a screen like the following. Make sure Disable SSLv3 and Disable TLSv1 are checked. There is no option to disable TLSv1.1 on older firmware versions.