Server 1.20.1 error

[nicolaspcs]

Hello I need your help urgently, I would appreciate it very much. I have a big problem. A few weeks ago I created this server in forge jar in version 1.20.1, I put mods and everything worked correctly, but from one day to another everything suddenly stopped working, specifically my problem is this: [LanServerPinger #1/WARN] [minecraft/LanServerPinger]: LanServerPinger: Network is unreachable: sendto. i can enter the server using localhost and everything works, but my friends can't connect. i looked for possible problems like: the firewall, antivirus, mods (i created a new server without mods and the same thing happens to me), configure my ip and dns to be static, check the server configuration of port 25565, restart my router, reinstall java and the problem still persists. what do i do?

my main problema is "[LanServerPinger #1/WARN] [net.minecraft.client.server.LanServerPinger/]: LanServerPinger: Network is unreachable: sendto" 

I'm going to share the last server without mods that I've made:     https://pastebin.com/rivhUQtL