Hello,
i've been using Aternos for quite a while and can say I had an amazing time here as I had no problems, untill now. Don't know why, but I constantly keep getting disconnected from my server within a minute of playing. The message I get upon disconnect is either "internal exception: java.io.ioexception: an existing connection was forcibly closed by remote host" or just "Disconnected". I have tried using mobile network to join the server (since I normally use ethernet cable connected to my local network) but I get disconnected even quicker. As I said, I have had no problems for at least half a year. I also recently started playing around with modpacks, played tekkit for a few days and had no problems. I am attaching a log file if it helps you in finding the issue.
Thanks.