Error code
Minecraft io.netty.channel.AbstractChannel$AnnotatedConnectException
MINECRAFTio.netty.channel.AbstractChannel$AnnotatedConnectException
Game/Platform Error· An error code shown by a game or gaming platform/launcher.
What it means
A low-level network exception thrown when the client cannot establish a TCP connection to the server.
How to fix it
- Restart your router.
- allow Java Platform SE binary through Windows Defender Firewall for both private and public.
- update Java to the latest version.
- add the server IP and port manually.
- reinstall Minecraft if needed.
Not affiliated with Minecraft. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.
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