aws-samples/dcv-web-portal An error occurred when connecting to load balanced DNS. Pls help me

Hello, I am currently creating infrastructure with the project in the link above https://github.com/aws-samples/dcv-web-portal. However, when connecting to the DNS containing the auth content of the instance created to connect through the load balance DNS, an error such as Error in connection task: TLS handshake error: received corrupt message of type InvalidContentType continues to occur. I don't know how to solve this. To solve this, I created a key file myself, but when I did that, the dcv -connection-gateway instance died. Please let me know what to do. If you need more information, I'll let you know in the comments.