lightsail ssh "connecting to instance..." can't connected to my instance with ssh

I answered the following in "Cannot SSH to Lightsail instance via AWS Console. Port 22 is open ". Will it help you?

In my case, I was able to connect by deleting Cookies (Chrome).
I don't know the cause, but when I couldn't connect, I was getting the following Websocket error in the console log.

Please open your lightsail console with browser traceless mode.