View the original community article here
Last tested: Apr 8, 2020
In order to connect to a Looker-hosted instance, the your web browser or API client must support TLS 1.2 with the following ciphers:
ECDHE-RSA-AES256-GCM-SHA384
ECDHE-RSA-AES128-GCM-SHA256
ECDSA ciphers are not supported at this time.
This content is subject to limited support.