diff --git a/profiler/src/main/java/com/navercorp/pinpoint/profiler/modifier/DefaultModifierRegistry.java b/profiler/src/main/java/com/navercorp/pinpoint/profiler/modifier/DefaultModifierRegistry.java
index 733949524..a7ab9a485 100644
--- a/profiler/src/main/java/com/navercorp/pinpoint/profiler/modifier/DefaultModifierRegistry.java
+++ b/profiler/src/main/java/com/navercorp/pinpoint/profiler/modifier/DefaultModifierRegistry.java
@@ -146,7 +146,7 @@ public class DefaultModifierRegistry implements ModifierRegistry {
             MemcachedClientModifier memcachedClientModifier = new MemcachedClientModifier(byteCodeInstrumentor, agent);
             addModifier(memcachedClientModifier);
 
-            FrontCacheMemcachedClientModifier frontCacheMemcachedClientModifier = new FrontCacheMemcachedClientModifier(byteCodeInstrumentor, agent);
+//            FrontCacheMemcachedClientModifier frontCacheMemcachedClientModifier = new FrontCacheMemcachedClientModifier(byteCodeInstrumentor, agent);
 //            관련 수정에 사이드 이펙트가 있이서 일단 disable함.
 //            addModifier(frontCacheMemcachedClientModifier);
 
@@ -169,7 +169,7 @@ public class DefaultModifierRegistry implements ModifierRegistry {
             OperationFutureModifier operationFutureModifier = new OperationFutureModifier(byteCodeInstrumentor, agent);
             addModifier(operationFutureModifier);
 
-            FrontCacheGetFutureModifier frontCacheGetFutureModifier = new FrontCacheGetFutureModifier(byteCodeInstrumentor, agent);
+//            FrontCacheGetFutureModifier frontCacheGetFutureModifier = new FrontCacheGetFutureModifier(byteCodeInstrumentor, agent);
             //            관련 수정에 사이드 이펙트가 있이서 일단 disable함.
 //            addModifier(frontCacheGetFutureModifier);
 
diff --git a/thrift/src/main/java/com/navercorp/pinpoint/thrift/io/HeaderTBaseSerializer.java b/thrift/src/main/java/com/navercorp/pinpoint/thrift/io/HeaderTBaseSerializer.java
index 024098eb6..b9995b87e 100644
--- a/thrift/src/main/java/com/navercorp/pinpoint/thrift/io/HeaderTBaseSerializer.java
+++ b/thrift/src/main/java/com/navercorp/pinpoint/thrift/io/HeaderTBaseSerializer.java
@@ -17,6 +17,8 @@ import org.apache.thrift.transport.TIOStreamTransport;
  */
 public class HeaderTBaseSerializer {
 
+	private static final String UTF8 = "UTF8";
+
     private final ByteArrayOutputStream baos;
     private final TProtocol protocol;
     private final TBaseLocator locator;
@@ -61,14 +63,14 @@ public class HeaderTBaseSerializer {
     }
 
     /**
-     * Serialize the Thrift object into a Java string, using the default JVM
+     * Serialize the Thrift object into a Java string, using the UTF8
      * charset encoding.
      *
      * @param base The object to serialize
      * @return Serialized object as a String
      */
     public String toString(TBase<?, ?> base) throws TException {
-        return new String(serialize(base));
+        return toString(base, UTF8);
     }
  
     /**
diff --git a/thrift/src/main/java/com/navercorp/pinpoint/thrift/io/L4Packet.java b/thrift/src/main/java/com/navercorp/pinpoint/thrift/io/L4Packet.java
index 4d1626281..0b608b115 100644
--- a/thrift/src/main/java/com/navercorp/pinpoint/thrift/io/L4Packet.java
+++ b/thrift/src/main/java/com/navercorp/pinpoint/thrift/io/L4Packet.java
@@ -10,7 +10,7 @@ import org.apache.thrift.protocol.TProtocol;
  */
 public class L4Packet implements org.apache.thrift.TBase<L4Packet, org.apache.thrift.TFieldIdEnum>, java.io.Serializable, Cloneable, Comparable<L4Packet> {
 
-    private final Header header;
+    private final transient Header header;
 
     public L4Packet(Header header) {
         this.header = header;
diff --git a/thrift/src/main/java/com/navercorp/pinpoint/thrift/io/NetworkAvailabilityCheckPacket.java b/thrift/src/main/java/com/navercorp/pinpoint/thrift/io/NetworkAvailabilityCheckPacket.java
index c46c1cc60..03a9291c0 100644
--- a/thrift/src/main/java/com/navercorp/pinpoint/thrift/io/NetworkAvailabilityCheckPacket.java
+++ b/thrift/src/main/java/com/navercorp/pinpoint/thrift/io/NetworkAvailabilityCheckPacket.java
@@ -5,6 +5,8 @@ import org.apache.thrift.TException;
 import org.apache.thrift.TFieldIdEnum;
 import org.apache.thrift.protocol.TProtocol;
 
+import java.io.UnsupportedEncodingException;
+
 /**
  * @author netspider
  */
@@ -12,8 +14,19 @@ public class NetworkAvailabilityCheckPacket implements org.apache.thrift.TBase<N
 
 	private static final long serialVersionUID = -1170704876834222604L;
 	
-	public transient static final byte[] DATA_OK = "OK".getBytes(); 
-	
+	public transient static final byte[] DATA_OK = getBytes("OK");
+
+	private static byte[] getBytes(String str) {
+		if (str == null) {
+			throw new NullPointerException("str must not be null");
+		}
+		try {
+			return str.getBytes("UTF8");
+		} catch (UnsupportedEncodingException e) {
+			throw new RuntimeException("encoding error. Caused:" + e.getMessage(), e);
+		}
+	}
+
 	@Override
 	public void read(TProtocol tProtocol) throws TException {
 	}
diff --git a/thrift/src/main/java/com/navercorp/pinpoint/thrift/io/UnsafeByteArrayOutputStream.java b/thrift/src/main/java/com/navercorp/pinpoint/thrift/io/UnsafeByteArrayOutputStream.java
index 76cf7f219..5921878e2 100644
--- a/thrift/src/main/java/com/navercorp/pinpoint/thrift/io/UnsafeByteArrayOutputStream.java
+++ b/thrift/src/main/java/com/navercorp/pinpoint/thrift/io/UnsafeByteArrayOutputStream.java
@@ -9,7 +9,7 @@ import java.util.Arrays;
 /**
  * @author emeroad
  */
-public class UnsafeByteArrayOutputStream extends ByteArrayOutputStream {
+public class UnsafeByteArrayOutputStream extends OutputStream {
 
     /**
      * The buffer where data is stored.