diff --git a/hamster-ball-bungeecord/build.gradle b/hamster-ball-bungeecord/build.gradle
index 9be566e..af0fd64 100644
--- a/hamster-ball-bungeecord/build.gradle
+++ b/hamster-ball-bungeecord/build.gradle
@@ -5,6 +5,7 @@ evaluationDependsOn(':hamster-ball-common')
 dependencies {
     apiShade(project(":hamster-ball-common")) { transitive = false }
 
+    //noinspection VulnerableLibrariesLocal
     compileOnly 'net.md-5:bungeecord-api:1.19-R0.1-SNAPSHOT'
 
     compileOnly "cn.hamster3.mc.plugin.core:bungeecord:${hamster_core_version}"
diff --git a/hamster-ball-common/src/main/java/cn/hamster3/mc/plugin/ball/common/api/BallAPI.java b/hamster-ball-common/src/main/java/cn/hamster3/mc/plugin/ball/common/api/BallAPI.java
index 79927dd..b52ebfa 100644
--- a/hamster-ball-common/src/main/java/cn/hamster3/mc/plugin/ball/common/api/BallAPI.java
+++ b/hamster-ball-common/src/main/java/cn/hamster3/mc/plugin/ball/common/api/BallAPI.java
@@ -51,14 +51,15 @@ public abstract class BallAPI {
 
     @NotNull
     private final BallConfig config;
+
     @NotNull
-    private final List<BallListener> listeners;
-
     private final Bootstrap bootstrap;
+    @NotNull
     private final EventLoopGroup executors;
-
     protected boolean enabled;
     protected Channel channel;
+    @NotNull
+    private List<BallListener> listeners;
 
     protected BallAPI(@NotNull BallConfig config) {
         this.config = config;
@@ -286,6 +287,11 @@ public abstract class BallAPI {
         if (channel != null) {
             return;
         }
+        try {
+            Thread.sleep(3000);
+        } catch (InterruptedException e) {
+            e.printStackTrace();
+        }
         reconnect(ttl - 1);
     }
 
@@ -683,12 +689,16 @@ public abstract class BallAPI {
     }
 
     public void addListener(@NotNull BallListener listener) {
-        listeners.add(listener);
-        listeners.sort(Comparator.comparing(BallListener::getPriority));
+        ArrayList<BallListener> newListeners = new ArrayList<>(listeners);
+        newListeners.add(listener);
+        newListeners.sort(Comparator.comparing(BallListener::getPriority));
+        listeners = newListeners;
     }
 
     public void removeListener(@NotNull BallListener listener) {
-        listeners.remove(listener);
+        ArrayList<BallListener> newListeners = new ArrayList<>(listeners);
+        newListeners.remove(listener);
+        listeners = newListeners;
     }
 
     /**
diff --git a/hamster-ball-common/src/main/java/cn/hamster3/mc/plugin/ball/common/connector/BallChannelHandler.java b/hamster-ball-common/src/main/java/cn/hamster3/mc/plugin/ball/common/connector/BallChannelHandler.java
index 507ac72..8a3ff60 100644
--- a/hamster-ball-common/src/main/java/cn/hamster3/mc/plugin/ball/common/connector/BallChannelHandler.java
+++ b/hamster-ball-common/src/main/java/cn/hamster3/mc/plugin/ball/common/connector/BallChannelHandler.java
@@ -27,7 +27,11 @@ public class BallChannelHandler extends SimpleChannelInboundHandler<String> {
         }
         if ("connection refused".equals(message)) {
             for (BallListener listener : BallAPI.getInstance().getListeners()) {
-                listener.onConnectRefused();
+                try {
+                    listener.onConnectRefused();
+                } catch (Exception | Error e) {
+                    e.printStackTrace();
+                }
             }
             return;
         }
diff --git a/hamster-ball-common/src/main/java/cn/hamster3/mc/plugin/ball/common/connector/BallChannelInitializer.java b/hamster-ball-common/src/main/java/cn/hamster3/mc/plugin/ball/common/connector/BallChannelInitializer.java
index 321ee74..166a1a3 100644
--- a/hamster-ball-common/src/main/java/cn/hamster3/mc/plugin/ball/common/connector/BallChannelInitializer.java
+++ b/hamster-ball-common/src/main/java/cn/hamster3/mc/plugin/ball/common/connector/BallChannelInitializer.java
@@ -1,7 +1,7 @@
 package cn.hamster3.mc.plugin.ball.common.connector;
 
 import io.netty.channel.ChannelInitializer;
-import io.netty.channel.socket.nio.NioSocketChannel;
+import io.netty.channel.socket.SocketChannel;
 import io.netty.handler.codec.LengthFieldBasedFrameDecoder;
 import io.netty.handler.codec.LengthFieldPrepender;
 import io.netty.handler.codec.string.StringDecoder;
@@ -12,14 +12,14 @@ import org.jetbrains.annotations.NotNull;
 import java.nio.charset.StandardCharsets;
 import java.util.concurrent.TimeUnit;
 
-public class BallChannelInitializer extends ChannelInitializer<NioSocketChannel> {
+public class BallChannelInitializer extends ChannelInitializer<SocketChannel> {
     public BallChannelInitializer() {
     }
 
     @Override
-    protected void initChannel(@NotNull NioSocketChannel channel) {
+    protected void initChannel(@NotNull SocketChannel channel) {
         channel.pipeline()
-                .addLast(new IdleStateHandler(0, 7, 0, TimeUnit.SECONDS))
+                .addLast(new IdleStateHandler(0, 5, 0, TimeUnit.SECONDS))
                 .addLast(new BallKeepAliveHandler())
                 .addLast(new LengthFieldPrepender(8))
                 .addLast(new LengthFieldBasedFrameDecoder(Integer.MAX_VALUE, 0, 8, 0, 8))
diff --git a/hamster-ball-server/src/main/java/cn/hamster3/mc/plugin/ball/server/config/ServerConfig.java b/hamster-ball-server/src/main/java/cn/hamster3/mc/plugin/ball/server/config/ServerConfig.java
index 8e1e439..c15e3b2 100644
--- a/hamster-ball-server/src/main/java/cn/hamster3/mc/plugin/ball/server/config/ServerConfig.java
+++ b/hamster-ball-server/src/main/java/cn/hamster3/mc/plugin/ball/server/config/ServerConfig.java
@@ -31,8 +31,8 @@ public final class ServerConfig {
             map = new Yaml().load(stream);
         }
 
-        host = (String) map.get("host");
-        port = (int) map.get("port");
+        host = map.getOrDefault("host", "localhost").toString();
+        port = (int) map.getOrDefault("port", 58888);
         eventLoopThread = (int) map.getOrDefault("event-loop-thread", 5);
         enableAcceptList = (boolean) map.get("enable-accept-list");
         acceptList = (List<String>) map.get("accept-list");
diff --git a/hamster-ball-server/src/main/java/cn/hamster3/mc/plugin/ball/server/connector/BallServerChannelHandler.java b/hamster-ball-server/src/main/java/cn/hamster3/mc/plugin/ball/server/connector/BallServerChannelHandler.java
index b0327eb..dd22fbd 100644
--- a/hamster-ball-server/src/main/java/cn/hamster3/mc/plugin/ball/server/connector/BallServerChannelHandler.java
+++ b/hamster-ball-server/src/main/java/cn/hamster3/mc/plugin/ball/server/connector/BallServerChannelHandler.java
@@ -20,7 +20,7 @@ public class BallServerChannelHandler extends SimpleChannelInboundHandler<String
     @Override
     protected void channelRead0(ChannelHandlerContext context, String message) {
         if ("ping".equals(message)) {
-            context.writeAndFlush("pong");
+            context.channel().writeAndFlush("pong");
             return;
         }
         try {
diff --git a/hamster-ball-server/src/main/java/cn/hamster3/mc/plugin/ball/server/connector/BallServerChannelInitializer.java b/hamster-ball-server/src/main/java/cn/hamster3/mc/plugin/ball/server/connector/BallServerChannelInitializer.java
index 5821ecd..9feff75 100644
--- a/hamster-ball-server/src/main/java/cn/hamster3/mc/plugin/ball/server/connector/BallServerChannelInitializer.java
+++ b/hamster-ball-server/src/main/java/cn/hamster3/mc/plugin/ball/server/connector/BallServerChannelInitializer.java
@@ -4,7 +4,7 @@ import cn.hamster3.mc.plugin.ball.common.data.BallMessageInfo;
 import cn.hamster3.mc.plugin.ball.server.config.ServerConfig;
 import io.netty.channel.Channel;
 import io.netty.channel.ChannelInitializer;
-import io.netty.channel.socket.nio.NioSocketChannel;
+import io.netty.channel.socket.SocketChannel;
 import io.netty.handler.codec.LengthFieldBasedFrameDecoder;
 import io.netty.handler.codec.LengthFieldPrepender;
 import io.netty.handler.codec.string.StringDecoder;
@@ -14,12 +14,13 @@ import org.jetbrains.annotations.NotNull;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
+import java.net.InetSocketAddress;
 import java.nio.charset.StandardCharsets;
 import java.util.ArrayList;
 import java.util.List;
 import java.util.concurrent.TimeUnit;
 
-public class BallServerChannelInitializer extends ChannelInitializer<NioSocketChannel> {
+public class BallServerChannelInitializer extends ChannelInitializer<SocketChannel> {
     public static final List<Channel> CHANNELS = new ArrayList<>();
     private static final Logger LOGGER = LoggerFactory.getLogger("BallServerChannelInitializer");
 
@@ -36,13 +37,26 @@ public class BallServerChannelInitializer extends ChannelInitializer<NioSocketCh
     }
 
     @Override
-    protected void initChannel(@NotNull NioSocketChannel channel) {
-        LOGGER.info("远程地址 {} 请求建立连接.", channel.remoteAddress().toString());
+    protected void initChannel(@NotNull SocketChannel channel) {
+        InetSocketAddress remoteAddress = channel.remoteAddress();
+        LOGGER.info("远程地址 {} 请求建立连接.", remoteAddress.toString());
 
-        String hostAddress = channel.remoteAddress().getAddress().getHostAddress();
+        String hostAddress = remoteAddress.getAddress().getHostAddress();
         if (ServerConfig.isEnableAcceptList() && !ServerConfig.getAcceptList().contains(hostAddress)) {
-            channel.disconnect();
-            LOGGER.warn("{} 不在白名单列表中, 已断开连接!", hostAddress);
+            LOGGER.warn("{} 不在白名单列表中, 断开连接!", hostAddress);
+
+            channel.pipeline()
+                    .addLast(new LengthFieldPrepender(8))
+                    .addLast(new LengthFieldBasedFrameDecoder(Integer.MAX_VALUE, 0, 8, 0, 8))
+                    .addLast(new StringDecoder(StandardCharsets.UTF_8))
+                    .addLast(new StringEncoder(StandardCharsets.UTF_8));
+
+            try {
+                channel.writeAndFlush("connection refused").await();
+                channel.disconnect().await();
+            } catch (InterruptedException e) {
+                e.printStackTrace();
+            }
             return;
         }