diff --git a/plugin-default-impl/nacos-default-auth-plugin/src/main/java/com/alibaba/nacos/plugin/auth/impl/controller/UserController.java b/plugin-default-impl/nacos-default-auth-plugin/src/main/java/com/alibaba/nacos/plugin/auth/impl/controller/UserController.java
index 554b920ba0a..ed904b83a6e 100644
--- a/plugin-default-impl/nacos-default-auth-plugin/src/main/java/com/alibaba/nacos/plugin/auth/impl/controller/UserController.java
+++ b/plugin-default-impl/nacos-default-auth-plugin/src/main/java/com/alibaba/nacos/plugin/auth/impl/controller/UserController.java
@@ -23,6 +23,7 @@
 import com.alibaba.nacos.common.model.RestResultUtils;
 import com.alibaba.nacos.common.utils.JacksonUtils;
 import com.alibaba.nacos.common.utils.StringUtils;
+import com.alibaba.nacos.core.context.RequestContextHolder;
 import com.alibaba.nacos.persistence.model.Page;
 import com.alibaba.nacos.plugin.auth.api.IdentityContext;
 import com.alibaba.nacos.plugin.auth.constant.ActionTypes;
@@ -102,7 +103,11 @@ public class UserController {
     @Secured(resource = AuthConstants.CONSOLE_RESOURCE_NAME_PREFIX + "users", action = ActionTypes.WRITE)
     @PostMapping
     public Object createUser(@RequestParam String username, @RequestParam String password) {
-        
+        if (AuthConstants.DEFAULT_USER.equals(username)) {
+            return RestResultUtils.failed(HttpStatus.CONFLICT.value(),
+                    "User `nacos` is default admin user. Please use `/nacos/v1/auth/users/admin` API to init `nacos` users. "
+                            + "Detail see `https://nacos.io/docs/latest/manual/admin/auth/#31-%E8%AE%BE%E7%BD%AE%E7%AE%A1%E7%90%86%E5%91%98%E5%AF%86%E7%A0%81`");
+        }
         User user = userDetailsService.getUserFromDatabase(username);
         if (user != null) {
             throw new IllegalArgumentException("user '" + username + "' already exist!");
@@ -202,8 +207,7 @@ private boolean hasPermission(String username, HttpServletRequest request)
         if (!authConfigs.isAuthEnabled()) {
             return true;
         }
-        IdentityContext identityContext = (IdentityContext) request.getSession()
-                .getAttribute(com.alibaba.nacos.plugin.auth.constant.Constants.Identity.IDENTITY_CONTEXT);
+        IdentityContext identityContext = RequestContextHolder.getContext().getAuthContext().getIdentityContext();
         if (identityContext == null) {
             throw new HttpSessionRequiredException("session expired!");
         }
@@ -324,7 +328,6 @@ public RestResult<String> updatePassword(@RequestParam(value = "oldPassword") St
         }
     }
     
-    
     /**
      * Fuzzy matching username.
      *
diff --git a/plugin-default-impl/nacos-default-auth-plugin/src/test/java/com/alibaba/nacos/plugin/auth/impl/controller/UserControllerTest.java b/plugin-default-impl/nacos-default-auth-plugin/src/test/java/com/alibaba/nacos/plugin/auth/impl/controller/UserControllerTest.java
index 3a88a98a067..391d55a0b6d 100644
--- a/plugin-default-impl/nacos-default-auth-plugin/src/test/java/com/alibaba/nacos/plugin/auth/impl/controller/UserControllerTest.java
+++ b/plugin-default-impl/nacos-default-auth-plugin/src/test/java/com/alibaba/nacos/plugin/auth/impl/controller/UserControllerTest.java
@@ -18,6 +18,7 @@
 
 import com.alibaba.nacos.auth.config.AuthConfigs;
 import com.alibaba.nacos.common.model.RestResult;
+import com.alibaba.nacos.core.context.RequestContextHolder;
 import com.alibaba.nacos.persistence.model.Page;
 import com.alibaba.nacos.plugin.auth.api.IdentityContext;
 import com.alibaba.nacos.plugin.auth.exception.AccessException;
@@ -33,6 +34,7 @@
 import com.alibaba.nacos.sys.env.EnvUtil;
 import com.fasterxml.jackson.databind.JsonNode;
 import com.fasterxml.jackson.databind.node.ObjectNode;
+import org.junit.jupiter.api.AfterEach;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.extension.ExtendWith;
@@ -105,6 +107,12 @@ void setUp() throws Exception {
                 AuthConstants.DEFAULT_TOKEN_EXPIRE_SECONDS.toString());
         
         EnvUtil.setEnvironment(mockEnvironment);
+        RequestContextHolder.getContext().getAuthContext().setIdentityContext(new IdentityContext());
+    }
+    
+    @AfterEach
+    public void tearDown() {
+        RequestContextHolder.removeContext();
     }
     
     @Test
@@ -123,20 +131,26 @@ void testLoginWithAuthedUser() throws AccessException, IOException {
     
     @Test
     void testCreateUser1() {
-        when(userDetailsService.getUserFromDatabase("nacos")).thenReturn(null);
-        RestResult<String> result = (RestResult<String>) userController.createUser("nacos", "test");
+        when(userDetailsService.getUserFromDatabase("test")).thenReturn(null);
+        RestResult<String> result = (RestResult<String>) userController.createUser("test", "test");
         assertEquals(200, result.getCode());
         
     }
     
     @Test
     void testCreateUser2() {
-        when(userDetailsService.getUserFromDatabase("nacos")).thenReturn(new User());
+        when(userDetailsService.getUserFromDatabase("test")).thenReturn(new User());
         assertThrows(IllegalArgumentException.class, () -> {
-            userController.createUser("nacos", "test");
+            userController.createUser("test", "test");
         });
     }
     
+    @Test
+    void testCreateUserNamedNacos() {
+        RestResult<String> result = (RestResult<String>) userController.createUser("nacos", "test");
+        assertEquals(409, result.getCode());
+    }
+    
     @Test
     void testCreateAdminUser1() {
         when(authConfigs.getNacosAuthSystemType()).thenReturn(AuthSystemTypes.NACOS.name());
@@ -221,7 +235,7 @@ void testUpdateUser2() {
     
     @Test
     void testUpdateUser3() throws IOException {
-        
+        RequestContextHolder.getContext().getAuthContext().setIdentityContext(null);
         when(authConfigs.isAuthEnabled()).thenReturn(true);
         MockHttpServletRequest mockHttpServletRequest = new MockHttpServletRequest();
         MockHttpServletResponse mockHttpServletResponse = new MockHttpServletResponse();
@@ -234,15 +248,11 @@ void testUpdateUser3() throws IOException {
     
     @Test
     void testUpdateUser4() throws IOException {
-        
+        RequestContextHolder.getContext().getAuthContext().getIdentityContext()
+                .setParameter(AuthConstants.NACOS_USER_KEY, user);
         when(authConfigs.isAuthEnabled()).thenReturn(true);
         when(userDetailsService.getUserFromDatabase(anyString())).thenReturn(new User());
         MockHttpServletRequest mockHttpServletRequest = new MockHttpServletRequest();
-        IdentityContext identityContext = new IdentityContext();
-        identityContext.setParameter(AuthConstants.NACOS_USER_KEY, user);
-        mockHttpServletRequest.getSession()
-                .setAttribute(com.alibaba.nacos.plugin.auth.constant.Constants.Identity.IDENTITY_CONTEXT,
-                        identityContext);
         MockHttpServletResponse mockHttpServletResponse = new MockHttpServletResponse();
         RestResult<String> result = (RestResult<String>) userController.updateUser("nacos", "test",
                 mockHttpServletResponse, mockHttpServletRequest);
@@ -252,17 +262,13 @@ void testUpdateUser4() throws IOException {
     
     @Test
     void testUpdateUser5() throws IOException, AccessException {
-        
+        RequestContextHolder.getContext().getAuthContext().getIdentityContext()
+                .setParameter(AuthConstants.NACOS_USER_KEY, null);
         when(authConfigs.isAuthEnabled()).thenReturn(true);
         when(userDetailsService.getUserFromDatabase(anyString())).thenReturn(new User());
         when(authenticationManager.authenticate(any(MockHttpServletRequest.class))).thenReturn(user);
         
         MockHttpServletRequest mockHttpServletRequest = new MockHttpServletRequest();
-        IdentityContext identityContext = new IdentityContext();
-        identityContext.setParameter(AuthConstants.NACOS_USER_KEY, null);
-        mockHttpServletRequest.getSession()
-                .setAttribute(com.alibaba.nacos.plugin.auth.constant.Constants.Identity.IDENTITY_CONTEXT,
-                        identityContext);
         MockHttpServletResponse mockHttpServletResponse = new MockHttpServletResponse();
         RestResult<String> result = (RestResult<String>) userController.updateUser("nacos", "test",
                 mockHttpServletResponse, mockHttpServletRequest);
@@ -272,16 +278,12 @@ void testUpdateUser5() throws IOException, AccessException {
     
     @Test
     void testUpdateUser6() throws IOException, AccessException {
-        
+        RequestContextHolder.getContext().getAuthContext().getIdentityContext()
+                .setParameter(AuthConstants.NACOS_USER_KEY, null);
         when(authConfigs.isAuthEnabled()).thenReturn(true);
         when(authenticationManager.authenticate(any(MockHttpServletRequest.class))).thenReturn(null);
         
         MockHttpServletRequest mockHttpServletRequest = new MockHttpServletRequest();
-        IdentityContext identityContext = new IdentityContext();
-        identityContext.setParameter(AuthConstants.NACOS_USER_KEY, null);
-        mockHttpServletRequest.getSession()
-                .setAttribute(com.alibaba.nacos.plugin.auth.constant.Constants.Identity.IDENTITY_CONTEXT,
-                        identityContext);
         MockHttpServletResponse mockHttpServletResponse = new MockHttpServletResponse();
         Object result = userController.updateUser("nacos", "test", mockHttpServletResponse, mockHttpServletRequest);
         
@@ -292,17 +294,13 @@ void testUpdateUser6() throws IOException, AccessException {
     
     @Test
     void testUpdateUser7() throws IOException, AccessException {
-        
+        RequestContextHolder.getContext().getAuthContext().getIdentityContext()
+                .setParameter(AuthConstants.NACOS_USER_KEY, null);
         when(authConfigs.isAuthEnabled()).thenReturn(true);
         when(authenticationManager.authenticate(any(MockHttpServletRequest.class))).thenThrow(
                 new AccessException("test"));
         
         MockHttpServletRequest mockHttpServletRequest = new MockHttpServletRequest();
-        IdentityContext identityContext = new IdentityContext();
-        identityContext.setParameter(AuthConstants.NACOS_USER_KEY, null);
-        mockHttpServletRequest.getSession()
-                .setAttribute(com.alibaba.nacos.plugin.auth.constant.Constants.Identity.IDENTITY_CONTEXT,
-                        identityContext);
         MockHttpServletResponse mockHttpServletResponse = new MockHttpServletResponse();
         Object result = userController.updateUser("nacos", "test", mockHttpServletResponse, mockHttpServletRequest);