It is normal for it to look like this

[Anormalman1]

ERROR 1155 --- [ XNIO-1 task-2] l.server.io.HandshakeInterceptorImpl : Authentication failed from /172.31.128.1:56154

[topi314]

normal in what sense? If you provide the wrong password yes

[Anormalman1]

i dont know is a secure one or not

[topi314]

i dont know is a secure one or not

I don't really understand what you mean by that, but just because you entered port 443 doesn't make it https or wss

your application.yml looks okay besides that

[Anormalman1]

I do not know if what i need to put

[topi314]

prob false if you're not running https / wss

[topi314]

it seems like you're not even using official lavalink so this is the wrong place to ask for help in the first place