Fix For Warning SSL Medium Strength Cipher Suites Supported (SWEET32)

I recently ran into an issue where users were getting “SSL Medium Strength Cipher Suites Supported (SWEET32)” looking into the issue I found the following on the Nessus support site.

The remote host supports the use of SSL ciphers that offer medium-strength encryption. Nessus regards medium strength as any encryption that uses key lengths at least 64 bits and less than 112 bits, or else that uses the 3DES encryption suite.

To disable the Three DES ciphers run

https://www.nartac.com/Products/IISCrypto/

Click on best Best Practices

Under Ciphers

Uncheck Triples DES 168

Check Reboot and Hit Apply

The server will reboot and disable this protocol.

You must reboot for the changes to take effect.

I would recommend disabling protocals TLS 1.0 and 1.1 on your devices if you can for security purposes.

Uncheck TLS 1.0 and TLS 1.1 under Server Protocols

Check Reboot and Hit Apply

This will reboot the server for the changes to take effect.

With these 2 protocols disabled and the 3DES ciphers disabled, this warning should go away when you do your next scan.