diff --git a/rxlib/src/main/java/org/rx/net/socks/ProxyChannelIdleHandler.java b/rxlib/src/main/java/org/rx/net/socks/ProxyChannelIdleHandler.java
index 6daf9c40..79a22930 100644
--- a/rxlib/src/main/java/org/rx/net/socks/ProxyChannelIdleHandler.java
+++ b/rxlib/src/main/java/org/rx/net/socks/ProxyChannelIdleHandler.java
@@ -19,13 +19,9 @@ public ProxyChannelIdleHandler(int readerIdleTimeSeconds, int writerIdleTimeSeco
     @Override
     protected void channelIdle(ChannelHandlerContext ctx, IdleStateEvent evt) {
         Channel channel = ctx.channel();
-        if (channel == null) {
-            return;
-        }
-
         log.info("{} {} idle: {}", Sockets.protocolName(channel), channel, evt.state());
-        SocksContext sc = SocksContext.ctx(channel);
-        if (sc.onClose != null) {
+        SocksContext sc = SocksContext.ctx(channel, false);
+        if (sc != null && sc.onClose != null) {
             sc.onClose.invoke();
         }
         super.channelIdle(ctx, evt);
diff --git a/rxlib/src/main/java/org/rx/net/socks/SocksContext.java b/rxlib/src/main/java/org/rx/net/socks/SocksContext.java
index 6cb36f00..94214c45 100644
--- a/rxlib/src/main/java/org/rx/net/socks/SocksContext.java
+++ b/rxlib/src/main/java/org/rx/net/socks/SocksContext.java
@@ -33,7 +33,7 @@
 public final class SocksContext extends EventArgs {
     private static final long serialVersionUID = 323020524764860674L;
     static final AttributeKey<SocksProxyServer> SERVER = AttributeKey.valueOf("SERVER");
-    static final AttributeKey<SocksContext> CTX = AttributeKey.valueOf("PROXY_CTX");
+    private static final AttributeKey<SocksContext> CTX = AttributeKey.valueOf("PROXY_CTX");
     //ss
     static final AttributeKey<ShadowsocksServer> SS_SERVER = AttributeKey.valueOf("SS_SERVER");
 
@@ -56,7 +56,11 @@ public static void mark(Channel inbound, Channel outbound, SocksContext sc, bool
     }
 
     public static SocksContext ctx(Channel channel) {
-        return require(channel.attr(CTX).get());
+        return ctx(channel, true);
+    }
+
+    public static SocksContext ctx(Channel channel, boolean throwOnEmpty) {
+        return throwOnEmpty ? require(channel.attr(CTX).get()) : channel.attr(CTX).get();
     }
 
     //region common
diff --git a/rxlib/src/test/java/org/rx/net/TestSocks.java b/rxlib/src/test/java/org/rx/net/TestSocks.java
index dd7bea31..bc2d535f 100644
--- a/rxlib/src/test/java/org/rx/net/TestSocks.java
+++ b/rxlib/src/test/java/org/rx/net/TestSocks.java
@@ -523,7 +523,7 @@ public void ssProxy() {
         SocksUser usr = new SocksUser("rocky");
         usr.setPassword(defPwd);
         usr.setMaxIpCount(-1);
-        SocksProxyServer backSvr = new SocksProxyServer(backConf, Authenticator.dbAuth(Collections.singletonList(usr), null));
+        SocksProxyServer backSvr = new SocksProxyServer(backConf, new DefaultSocksAuthenticator(Collections.singletonList(usr)));
 
         RpcServerConfig rpcServerConf = new RpcServerConfig(new TcpServerConfig(backSrvEp.getPort() + 1));
         rpcServerConf.getTcpConfig().setTransportFlags(TransportFlags.FRONTEND_COMPRESS.flags());