diff --git a/hbase-server/src/main/java/org/apache/hadoop/hbase/ipc/NettyHBaseSaslRpcServerHandler.java b/hbase-server/src/main/java/org/apache/hadoop/hbase/ipc/NettyHBaseSaslRpcServerHandler.java
index cb7a173625e1..dd6f84daae3c 100644
--- a/hbase-server/src/main/java/org/apache/hadoop/hbase/ipc/NettyHBaseSaslRpcServerHandler.java
+++ b/hbase-server/src/main/java/org/apache/hadoop/hbase/ipc/NettyHBaseSaslRpcServerHandler.java
@@ -17,20 +17,16 @@
  */
 package org.apache.hadoop.hbase.ipc;
 
-import java.io.IOException;
 import org.apache.hadoop.hbase.security.HBaseSaslRpcServer;
 import org.apache.hadoop.hbase.security.SaslStatus;
 import org.apache.hadoop.hbase.security.SaslUnwrapHandler;
 import org.apache.hadoop.hbase.security.SaslWrapHandler;
 import org.apache.hadoop.hbase.util.NettyFutureUtils;
 import org.apache.hadoop.io.BytesWritable;
-import org.apache.hadoop.io.Writable;
-import org.apache.hadoop.io.WritableUtils;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
 import org.apache.hbase.thirdparty.io.netty.buffer.ByteBuf;
-import org.apache.hbase.thirdparty.io.netty.buffer.ByteBufOutputStream;
 import org.apache.hbase.thirdparty.io.netty.channel.ChannelHandlerContext;
 import org.apache.hbase.thirdparty.io.netty.channel.ChannelPipeline;
 import org.apache.hbase.thirdparty.io.netty.channel.SimpleChannelInboundHandler;
@@ -54,23 +50,6 @@ class NettyHBaseSaslRpcServerHandler extends SimpleChannelInboundHandler<ByteBuf
     this.conn = conn;
   }
 
-  private void doResponse(ChannelHandlerContext ctx, SaslStatus status, Writable rv,
-    String errorClass, String error) throws IOException {
-    // In my testing, have noticed that sasl messages are usually
-    // in the ballpark of 100-200. That's why the initial capacity is 256.
-    ByteBuf resp = ctx.alloc().buffer(256);
-    try (ByteBufOutputStream out = new ByteBufOutputStream(resp)) {
-      out.writeInt(status.state); // write status
-      if (status == SaslStatus.SUCCESS) {
-        rv.write(out);
-      } else {
-        WritableUtils.writeString(out, errorClass);
-        WritableUtils.writeString(out, error);
-      }
-    }
-    NettyFutureUtils.safeWriteAndFlush(ctx, resp);
-  }
-
   @Override
   protected void channelRead0(ChannelHandlerContext ctx, ByteBuf msg) throws Exception {
     LOG.debug("Read input token of size={} for processing by saslServer.evaluateResponse()",
@@ -81,7 +60,7 @@ protected void channelRead0(ChannelHandlerContext ctx, ByteBuf msg) throws Excep
     byte[] replyToken = saslServer.evaluateResponse(saslToken);
     if (replyToken != null) {
       LOG.debug("Will send token of size {} from saslServer.", replyToken.length);
-      doResponse(ctx, SaslStatus.SUCCESS, new BytesWritable(replyToken), null, null);
+      conn.doRawSaslReply(SaslStatus.SUCCESS, new BytesWritable(replyToken), null, null);
     }
     if (saslServer.isComplete()) {
       conn.finishSaslNegotiation();
@@ -105,7 +84,7 @@ protected void channelRead0(ChannelHandlerContext ctx, ByteBuf msg) throws Excep
   public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
     LOG.error("Error when doing SASL handshade, provider={}", conn.provider, cause);
     Throwable sendToClient = HBaseSaslRpcServer.unwrap(cause);
-    doResponse(ctx, SaslStatus.ERROR, null, sendToClient.getClass().getName(),
+    conn.doRawSaslReply(SaslStatus.ERROR, null, sendToClient.getClass().getName(),
       sendToClient.getLocalizedMessage());
     rpcServer.metrics.authenticationFailure();
     String clientIP = this.toString();
diff --git a/hbase-server/src/test/java/org/apache/hadoop/hbase/ipc/TestSecurityRpcSentBytesMetrics.java b/hbase-server/src/test/java/org/apache/hadoop/hbase/ipc/TestSecurityRpcSentBytesMetrics.java
new file mode 100644
index 000000000000..b5e46b5c7cf5
--- /dev/null
+++ b/hbase-server/src/test/java/org/apache/hadoop/hbase/ipc/TestSecurityRpcSentBytesMetrics.java
@@ -0,0 +1,155 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.hadoop.hbase.ipc;
+
+import static org.apache.hadoop.hbase.ipc.TestProtobufRpcServiceImpl.SERVICE;
+import static org.apache.hadoop.hbase.ipc.TestProtobufRpcServiceImpl.newBlockingStub;
+import static org.apache.hadoop.hbase.security.HBaseKerberosUtils.getKeytabFileForTesting;
+import static org.apache.hadoop.hbase.security.HBaseKerberosUtils.getPrincipalForTesting;
+import static org.apache.hadoop.hbase.security.HBaseKerberosUtils.loginKerberosPrincipal;
+import static org.apache.hadoop.hbase.security.HBaseKerberosUtils.setSecuredConfiguration;
+import static org.junit.Assert.assertTrue;
+
+import java.io.File;
+import java.net.InetSocketAddress;
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.hbase.HBaseClassTestRule;
+import org.apache.hadoop.hbase.HBaseTestingUtil;
+import org.apache.hadoop.hbase.HConstants;
+import org.apache.hadoop.hbase.security.HBaseKerberosUtils;
+import org.apache.hadoop.hbase.security.SecurityInfo;
+import org.apache.hadoop.hbase.security.User;
+import org.apache.hadoop.hbase.testclassification.MediumTests;
+import org.apache.hadoop.hbase.testclassification.SecurityTests;
+import org.apache.hadoop.minikdc.MiniKdc;
+import org.apache.hadoop.security.UserGroupInformation;
+import org.junit.AfterClass;
+import org.junit.Before;
+import org.junit.BeforeClass;
+import org.junit.ClassRule;
+import org.junit.Test;
+import org.junit.experimental.categories.Category;
+import org.mockito.Mockito;
+
+import org.apache.hbase.thirdparty.com.google.common.collect.Lists;
+
+import org.apache.hadoop.hbase.shaded.ipc.protobuf.generated.TestProtos;
+import org.apache.hadoop.hbase.shaded.ipc.protobuf.generated.TestRpcServiceProtos.TestProtobufRpcProto.BlockingInterface;
+
+@Category({ SecurityTests.class, MediumTests.class })
+public class TestSecurityRpcSentBytesMetrics {
+
+  @ClassRule
+  public static final HBaseClassTestRule CLASS_RULE =
+    HBaseClassTestRule.forClass(TestSecurityRpcSentBytesMetrics.class);
+
+  protected static final HBaseTestingUtil TEST_UTIL = new HBaseTestingUtil();
+
+  protected static final File KEYTAB_FILE =
+    new File(TEST_UTIL.getDataTestDir("keytab").toUri().getPath());
+
+  protected static MiniKdc KDC;
+  protected static String HOST = "localhost";
+  protected static String PRINCIPAL;
+
+  protected String krbKeytab;
+  protected String krbPrincipal;
+  protected UserGroupInformation ugi;
+  protected Configuration clientConf;
+  protected Configuration serverConf;
+
+  protected static void initKDCAndConf() throws Exception {
+    KDC = TEST_UTIL.setupMiniKdc(KEYTAB_FILE);
+    PRINCIPAL = "hbase/" + HOST;
+    KDC.createPrincipal(KEYTAB_FILE, PRINCIPAL);
+    HBaseKerberosUtils.setPrincipalForTesting(PRINCIPAL + "@" + KDC.getRealm());
+    // set a smaller timeout and retry to speed up tests
+    TEST_UTIL.getConfiguration().setInt(RpcClient.SOCKET_TIMEOUT_READ, 2000000000);
+    TEST_UTIL.getConfiguration().setInt("hbase.security.relogin.maxretries", 1);
+  }
+
+  protected static void stopKDC() throws InterruptedException {
+    if (KDC != null) {
+      KDC.stop();
+    }
+  }
+
+  protected final void setUpPrincipalAndConf() throws Exception {
+    krbKeytab = getKeytabFileForTesting();
+    krbPrincipal = getPrincipalForTesting();
+    ugi = loginKerberosPrincipal(krbKeytab, krbPrincipal);
+    clientConf = new Configuration(TEST_UTIL.getConfiguration());
+    setSecuredConfiguration(clientConf);
+    serverConf = new Configuration(TEST_UTIL.getConfiguration());
+    setSecuredConfiguration(serverConf);
+  }
+
+  @BeforeClass
+  public static void setUp() throws Exception {
+    initKDCAndConf();
+  }
+
+  @AfterClass
+  public static void tearDown() throws Exception {
+    stopKDC();
+    TEST_UTIL.cleanupTestDir();
+  }
+
+  @Before
+  public void setUpTest() throws Exception {
+    setUpPrincipalAndConf();
+  }
+
+  /**
+   * This test is for HBASE-27924, before this JIRA, bytes sent by
+   * {@link NettyHBaseSaslRpcServerHandler} is ignored by {@link MetricsHBaseServer#sentBytes}.
+   */
+  @Test
+  public void test() throws Exception {
+    SecurityInfo securityInfoMock = Mockito.mock(SecurityInfo.class);
+    Mockito.when(securityInfoMock.getServerPrincipal())
+      .thenReturn(HBaseKerberosUtils.KRB_PRINCIPAL);
+    SecurityInfo.addInfo("TestProtobufRpcProto", securityInfoMock);
+
+    NettyRpcServer rpcServer = new NettyRpcServer(null, getClass().getSimpleName(),
+      Lists.newArrayList(new RpcServer.BlockingServiceAndInterface(SERVICE, null)),
+      new InetSocketAddress(HOST, 0), serverConf, new FifoRpcScheduler(serverConf, 1), true) {
+
+      @Override
+      public void start() {
+        metrics = Mockito.spy(metrics);
+        super.start();
+      }
+    };
+
+    rpcServer.start();
+    try (NettyRpcClient rpcClient =
+      new NettyRpcClient(clientConf, HConstants.DEFAULT_CLUSTER_ID.toString(), null, null)) {
+      BlockingInterface stub = newBlockingStub(rpcClient, rpcServer.getListenerAddress(),
+        User.create(UserGroupInformation.getCurrentUser()));
+
+      String response =
+        stub.echo(null, TestProtos.EchoRequestProto.newBuilder().setMessage("test").build())
+          .getMessage();
+      assertTrue("test".equals(response));
+    } finally {
+      rpcServer.stop();
+    }
+    Mockito.verify(rpcServer.metrics, Mockito.atLeast(2)).sentBytes(Mockito.anyLong());
+  }
+}