Hello, a question I wanted to know because the following happens to me
I'm usually playing on a 1.15.1 server
unchanged, vanilla, and suddenly I get the ad that I put as a title or topic and I don't know why it happens. I'll leave the information on the console. Thanks they have helped me a lot with other problems. 10/10 
Sorry for the misspellings, but as I have already said that they do not speak Spanish and I am using the translator .. THANK YOU
Here is the announcement
that I get on the screen
hola, una buena pregunta que quería saber porque me sucede lo siguiente:
io.netty.channel.abstractchannel$annotatedconnectexception connection refused no further information