diff --git a/hadoop-common-project/hadoop-common/CHANGES.txt b/hadoop-common-project/hadoop-common/CHANGES.txt
index e8718795e7a..f8474243245 100644
--- a/hadoop-common-project/hadoop-common/CHANGES.txt
+++ b/hadoop-common-project/hadoop-common/CHANGES.txt
@@ -1064,6 +1064,9 @@ Release 0.23.7 - UNRELEASED
     HADOOP-9303. command manual dfsadmin missing entry for restoreFailedStorage
     option (Andy Isaacson via tgraves)
 
+    HADOOP-9339. IPC.Server incorrectly sets UGI auth type (Daryn Sharp by
+    kihwal)
+
 Release 0.23.6 - UNRELEASED
 
   INCOMPATIBLE CHANGES
diff --git a/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/ipc/Server.java b/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/ipc/Server.java
index cde5d0f197f..8567f68d93e 100644
--- a/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/ipc/Server.java
+++ b/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/ipc/Server.java
@@ -1511,9 +1511,6 @@ public abstract class Server {
       UserGroupInformation protocolUser = ProtoUtil.getUgi(connectionContext);
       if (saslServer == null) {
         user = protocolUser;
-        if (user != null) {
-          user.setAuthenticationMethod(AuthMethod.SIMPLE);
-        }
       } else {
         // user is authenticated
         user.setAuthenticationMethod(authMethod);
diff --git a/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/security/TestDoAsEffectiveUser.java b/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/security/TestDoAsEffectiveUser.java
index 129d4a06d0a..608cfb05cdf 100644
--- a/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/security/TestDoAsEffectiveUser.java
+++ b/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/security/TestDoAsEffectiveUser.java
@@ -180,7 +180,7 @@ public class TestDoAsEffectiveUser {
             }
           });
 
-      Assert.assertEquals(PROXY_USER_NAME + " (auth:SIMPLE) via " + REAL_USER_NAME + " (auth:SIMPLE)", retVal);
+      Assert.assertEquals(PROXY_USER_NAME + " (auth:PROXY) via " + REAL_USER_NAME + " (auth:SIMPLE)", retVal);
     } catch (Exception e) {
       e.printStackTrace();
       Assert.fail();
@@ -224,7 +224,7 @@ public class TestDoAsEffectiveUser {
             }
           });
 
-      Assert.assertEquals(PROXY_USER_NAME + " (auth:SIMPLE) via " + REAL_USER_NAME + " (auth:SIMPLE)", retVal);
+      Assert.assertEquals(PROXY_USER_NAME + " (auth:PROXY) via " + REAL_USER_NAME + " (auth:SIMPLE)", retVal);
     } catch (Exception e) {
       e.printStackTrace();
       Assert.fail();