diff --git a/src/main/java/cn/wowspeeder/encryption/CryptBase.java b/src/main/java/cn/wowspeeder/encryption/CryptBase.java
index 42fe77c..827317b 100644
--- a/src/main/java/cn/wowspeeder/encryption/CryptBase.java
+++ b/src/main/java/cn/wowspeeder/encryption/CryptBase.java
@@ -45,9 +45,9 @@ protected void setIV(byte[] iv, boolean isEncrypt) {
 		}
 
 		if (isEncrypt) {
-			_encryptIV = new byte[_ivLength];
-			System.arraycopy(iv, 0, _encryptIV, 0, _ivLength);
 			try {
+				_encryptIV = new byte[_ivLength];
+				System.arraycopy(iv, 0, _encryptIV, 0, _ivLength);
 				encCipher = getCipher(isEncrypt);
 				ParametersWithIV parameterIV = new ParametersWithIV(
 						new KeyParameter(_key.getEncoded()), _encryptIV);
@@ -56,9 +56,9 @@ protected void setIV(byte[] iv, boolean isEncrypt) {
 				logger.info(e.toString());
 			}
 		} else {
-			_decryptIV = new byte[_ivLength];
-			System.arraycopy(iv, 0, _decryptIV, 0, _ivLength);
 			try {
+				_decryptIV = new byte[_ivLength];
+				System.arraycopy(iv, 0, _decryptIV, 0, _ivLength);
 				decCipher = getCipher(isEncrypt);
 				ParametersWithIV parameterIV = new ParametersWithIV(
 						new KeyParameter(_key.getEncoded()), _decryptIV);
diff --git a/src/main/java/cn/wowspeeder/ss/SSCipherDecoder.java b/src/main/java/cn/wowspeeder/ss/SSCipherDecoder.java
index f75cf89..2bf9e14 100644
--- a/src/main/java/cn/wowspeeder/ss/SSCipherDecoder.java
+++ b/src/main/java/cn/wowspeeder/ss/SSCipherDecoder.java
@@ -19,7 +19,9 @@ protected void decode(ChannelHandlerContext ctx, ByteBuf msg, List<Object> list)
         ICrypt _crypt = ctx.channel().attr(SSCommon.CIPHER).get();
         byte[] data = CryptUtil.decrypt(_crypt, msg);
         if (data == null) {
-            ctx.close();
+            if (!ctx.channel().attr(SSCommon.IS_UDP).get()) {
+                ctx.close();
+            }
             return;
         }
         list.add(msg.retain().clear().writeBytes(data));//
diff --git a/src/main/java/cn/wowspeeder/ss/SSProtocolDecoder.java b/src/main/java/cn/wowspeeder/ss/SSProtocolDecoder.java
index ff7b13e..614134f 100644
--- a/src/main/java/cn/wowspeeder/ss/SSProtocolDecoder.java
+++ b/src/main/java/cn/wowspeeder/ss/SSProtocolDecoder.java
@@ -41,7 +41,9 @@ protected void decode(ChannelHandlerContext ctx, ByteBuf msg, List<Object> out)
             SSAddrRequest addrRequest = SSAddrRequest.getAddrRequest(msg);
             if (addrRequest == null) {
                 logger.error("failed to get address request from {}", ctx.channel().attr(SSCommon.CLIENT).get().getHostString());
-                ctx.close();
+                if (!ctx.channel().attr(SSCommon.IS_UDP).get()) {
+                    ctx.close();
+                }
                 return;
             }
             logger.debug(ctx.channel().id().toString() + " addressType = " + addrRequest.addressType() + ",host = " + addrRequest.host() + ",port = " + addrRequest.port() + ",dataBuff = "
diff --git a/src/main/java/cn/wowspeeder/ss/SSTcpProxyHandler.java b/src/main/java/cn/wowspeeder/ss/SSTcpProxyHandler.java
index e4b8023..9a0b920 100644
--- a/src/main/java/cn/wowspeeder/ss/SSTcpProxyHandler.java
+++ b/src/main/java/cn/wowspeeder/ss/SSTcpProxyHandler.java
@@ -97,8 +97,8 @@ public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws E
                 proxyClient
                         .connect(clientRecipient)
                         .addListener((ChannelFutureListener) future -> {
-                            if (future.isSuccess()) {
-                                try {
+                            try {
+                                if (future.isSuccess()) {
                                     logger.debug("channel id {}, {}<->{}<->{} connect  {}", clientCtx.channel().id().toString(), clientCtx.channel().remoteAddress().toString(), future.channel().localAddress().toString(), clientRecipient.toString(), future.isSuccess());
                                     remoteChannel = future.channel();
                                     if (clientBuffs != null) {
@@ -108,11 +108,11 @@ public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws E
                                         }
                                         clientBuffs = null;
                                     }
-                                } catch (Exception e) {
+                                } else {
+                                    logger.error("channel id {}, {}<->{} connect {},cause {}", clientCtx.channel().id().toString(), clientCtx.channel().remoteAddress().toString(), clientRecipient.toString(), future.isSuccess(), future.cause());
                                     proxyChannelClose();
                                 }
-                            } else {
-                                logger.error("channel id {}, {}<->{} connect {},cause {}", clientCtx.channel().id().toString(), clientCtx.channel().remoteAddress().toString(), clientRecipient.toString(), future.isSuccess(), future.cause());
+                            } catch (Exception e) {
                                 proxyChannelClose();
                             }
                         });
@@ -169,7 +169,7 @@ private void proxyChannelClose() {
                 clientChannel = null;
             }
         } catch (Exception e) {
-            logger.error("close channel error", e);
+//            logger.error("close channel error", e);
         }
     }
 }