When i want to join a server i can't except for a aternos server.

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Do you have an official Minecraft Java Account?

yes, i have

Can you please attach a screenshot of what it says when you can’t log in?

there you go

Read this https://www.minecraftstation.com/minecraft-error-code-io-netty-channel-abstractchannelannotatedconnectexception/

Tell me if any of those things solved your issue

Thank you for your report!
We're tracking this issue in MC-120362, so this ticket is being resolved and linked as a duplicate.

That ticket has already been resolved as invalid, which means this is a technical support issue. Please take a look at the parent ticket (MC-120362) and see if a solution is provided there.
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