When other people try to join my LAN game, they get an error called "io.netty.channel.ConnectTimeoutException: connection timed out:"

This has only happened in the last days, as we were able to play normally before. They also tried to connect with different Pc's and with different operating systems, but it was no use. Also we verified that we had everything ok with our firewalls and connection, and I uninstalled and reinstalled my game.

When they try to host a local game, I am able to connect to their world, but not viceversa.