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当在启动游戏的时候，出现 kffmod （kotlin for forge）报错，并且在日志中显示下面代码，可以判断为网络问题。
java
at sun.nio.ch.ServerSocketChannelImpl.netBind(ServerSocketChannelImpl.java:337) ~[?:?] {} at sun.nio.ch.ServerSocketChannelImpl.bind(ServerSocketChannelImpl.java:294) ~[?:?] {} at io.ktor.network.sockets.ConnectUtilsJvmKt.bind(ConnectUtilsJvm.kt:35) ~[create-track-map-1.4+mc1.20.1-neoforge.jar%23336!/:1.4] {re:classloading} at io.ktor.network.sockets.TcpSocketBuilder.bind(TcpSocketBuilder.kt:45) ~[create-track-map-1.4+mc1.20.1-neoforge.jar%23336!/:1.4] {re:classloading} at io.ktor.network.sockets.TcpSocketBuilder.bind(TcpSocketBuilder.kt:29) ~[create-track-map-1.4+mc1.20.1-neoforge.jar%23336!/:1.4] {re:classloading}解决方法：
打开 cmd 命令行窗口。
依次输入下面这部分代码：
netsh int ipv4 set dynamicport tcp start=49152 num=16383
netsh int ipv4 set dynamicport udp start=49152 num=16383
net stop winnat
net start winnat即可解决问题。
王海平