Problem with joining minecraft server?

I have the problem because today you can no longer join the (Aternos server) of my friends. Yesterday everything was still going today. WLAN somehow doesn't let me connect. Everything works with Handy Hotspot 🤷🏻♂️ On the photo you can see which problem message is coming

Try turning off the router, wait about 1 minute and then turn it on again. So just pull the power cable.

If it doesn't work then it may be due to the firewall

Here you can have a look: https://www.minecraftstation.com/minecraft-error-code-io-netty-channel-abstractchannelannotatedconnectexception/