today i was playing gtm but then i got timed out, when this happened it wouldnt let me log in and all it would say is the picture i put down there. none of my computers will work and i love playing gtm , ( btw im RDM606 )
thats happens to everyone try to restart your computer if it doesn't work after that is it now way to go on.
If you are still unable to connect and all of your computers don't work, I suspect your internet to be the cause of this. Try restarting your router.
If you haven't fixed the problem yet, you need to head over to the minecraft website, and log out of your account, then relog. This should be sufficient to fix the io.netty.channel issue.