diff --git a/components/device-mgt/org.wso2.carbon.device.mgt.core/src/main/java/org/wso2/carbon/device/mgt/core/dao/DeviceDAO.java b/components/device-mgt/org.wso2.carbon.device.mgt.core/src/main/java/org/wso2/carbon/device/mgt/core/dao/DeviceDAO.java
index 261e2e43107..0e56262c14e 100644
--- a/components/device-mgt/org.wso2.carbon.device.mgt.core/src/main/java/org/wso2/carbon/device/mgt/core/dao/DeviceDAO.java
+++ b/components/device-mgt/org.wso2.carbon.device.mgt.core/src/main/java/org/wso2/carbon/device/mgt/core/dao/DeviceDAO.java
@@ -22,7 +22,6 @@ import org.wso2.carbon.device.mgt.common.Device;
 import org.wso2.carbon.device.mgt.common.DeviceIdentifier;
 import org.wso2.carbon.device.mgt.common.EnrolmentInfo;
 import org.wso2.carbon.device.mgt.common.EnrolmentInfo.Status;
-import org.wso2.carbon.device.mgt.common.app.mgt.Application;
 
 import java.util.List;
 
@@ -42,16 +41,8 @@ public interface DeviceDAO {
      */
     int addDevice(int typeId, Device device, int tenantId) throws DeviceManagementDAOException;
 
-    /**
-     * This method is used to update a given device.
-     *
-     * @param typeId device type id.
-     * @param device device object.
-     * @param tenantId tenant id.
-     * @return returns the id of updated device.
-     * @throws DeviceManagementDAOException
-     */
-    int updateDevice(int typeId, Device device, int tenantId) throws DeviceManagementDAOException;
+
+    boolean updateDevice(int typeId, Device device, int tenantId) throws DeviceManagementDAOException;
 
     /**
      * This method is used to remove a device.
diff --git a/components/device-mgt/org.wso2.carbon.device.mgt.core/src/main/java/org/wso2/carbon/device/mgt/core/dao/impl/DeviceDAOImpl.java b/components/device-mgt/org.wso2.carbon.device.mgt.core/src/main/java/org/wso2/carbon/device/mgt/core/dao/impl/DeviceDAOImpl.java
index ae9a67f25a7..9f4ca53f4c6 100644
--- a/components/device-mgt/org.wso2.carbon.device.mgt.core/src/main/java/org/wso2/carbon/device/mgt/core/dao/impl/DeviceDAOImpl.java
+++ b/components/device-mgt/org.wso2.carbon.device.mgt.core/src/main/java/org/wso2/carbon/device/mgt/core/dao/impl/DeviceDAOImpl.java
@@ -66,11 +66,11 @@ public class DeviceDAOImpl implements DeviceDAO {
     }
 
     @Override
-    public int updateDevice(int typeId, Device device, int tenantId) throws DeviceManagementDAOException {
+    public boolean updateDevice(int typeId, Device device, int tenantId) throws DeviceManagementDAOException {
         Connection conn;
         PreparedStatement stmt = null;
-        ResultSet rs = null;
-        int deviceId = -1;
+        boolean status = false;
+        int rows;
         try {
             conn = this.getConnection();
             String sql = "UPDATE DM_DEVICE SET DESCRIPTION = ?, NAME = ? WHERE DEVICE_IDENTIFICATION = ? AND " +
@@ -81,18 +81,16 @@ public class DeviceDAOImpl implements DeviceDAO {
             stmt.setString(3, device.getDeviceIdentifier());
             stmt.setInt(4, typeId);
             stmt.setInt(5, tenantId);
-            stmt.executeUpdate();
-
-            rs = stmt.getGeneratedKeys();
-            if (rs.next()) {
-                deviceId = rs.getInt(1);
+            rows = stmt.executeUpdate();
+            if (rows > 0) {
+                status = true;
             }
-            return deviceId;
+            return status;
         } catch (SQLException e) {
             throw new DeviceManagementDAOException("Error occurred while enrolling device '" +
                     device.getName() + "'", e);
         } finally {
-            DeviceManagementDAOUtil.cleanupResources(stmt, rs);
+            DeviceManagementDAOUtil.cleanupResources(stmt, null);
         }
     }
 
diff --git a/components/device-mgt/org.wso2.carbon.device.mgt.core/src/main/java/org/wso2/carbon/device/mgt/core/service/DeviceManagementProviderServiceImpl.java b/components/device-mgt/org.wso2.carbon.device.mgt.core/src/main/java/org/wso2/carbon/device/mgt/core/service/DeviceManagementProviderServiceImpl.java
index d5000da8891..234666a8232 100644
--- a/components/device-mgt/org.wso2.carbon.device.mgt.core/src/main/java/org/wso2/carbon/device/mgt/core/service/DeviceManagementProviderServiceImpl.java
+++ b/components/device-mgt/org.wso2.carbon.device.mgt.core/src/main/java/org/wso2/carbon/device/mgt/core/service/DeviceManagementProviderServiceImpl.java
@@ -139,6 +139,7 @@ public class DeviceManagementProviderServiceImpl implements DeviceManagementProv
             EnrolmentInfo newEnrolmentInfo = device.getEnrolmentInfo();
             if (existingEnrolmentInfo != null && newEnrolmentInfo != null) {
                 if (existingEnrolmentInfo.equals(newEnrolmentInfo)) {
+                    device.setId(existingDevice.getId());
                     device.getEnrolmentInfo().setDateOfEnrolment(existingEnrolmentInfo.getDateOfEnrolment());
                     this.modifyEnrollment(device);
                     status = true;
@@ -214,8 +215,8 @@ public class DeviceManagementProviderServiceImpl implements DeviceManagementProv
             DeviceManagementDAOFactory.beginTransaction();
 
             DeviceType type = deviceTypeDAO.getDeviceType(device.getType());
-            int deviceId = deviceDAO.updateDevice(type.getId(), device, tenantId);
-            enrolmentDAO.updateEnrollment(deviceId, device.getEnrolmentInfo(), tenantId);
+            deviceDAO.updateDevice(type.getId(), device, tenantId);
+            enrolmentDAO.updateEnrollment(device.getId(), device.getEnrolmentInfo(), tenantId);
 
             DeviceManagementDAOFactory.commitTransaction();
         } catch (DeviceManagementDAOException e) {
diff --git a/components/webapp-authenticator-framework/org.wso2.carbon.webapp.authenticator.framework/src/main/java/org/wso2/carbon/webapp/authenticator/framework/WebappAuthenticationHandler.java b/components/webapp-authenticator-framework/org.wso2.carbon.webapp.authenticator.framework/src/main/java/org/wso2/carbon/webapp/authenticator/framework/WebappAuthenticationHandler.java
index 97683448320..c700fb304f3 100644
--- a/components/webapp-authenticator-framework/org.wso2.carbon.webapp.authenticator.framework/src/main/java/org/wso2/carbon/webapp/authenticator/framework/WebappAuthenticationHandler.java
+++ b/components/webapp-authenticator-framework/org.wso2.carbon.webapp.authenticator.framework/src/main/java/org/wso2/carbon/webapp/authenticator/framework/WebappAuthenticationHandler.java
@@ -35,7 +35,7 @@ public class WebappAuthenticationHandler extends CarbonTomcatValve {
 
     @Override
     public void invoke(Request request, Response response, CompositeValve compositeValve) {
-        if (this.isContextSkipped(request) || (this.isNonAdminService(request) && this.skipAuthentication(request))) {
+        if (this.isContextSkipped(request) || (!this.isAdminService(request) && this.skipAuthentication(request))) {
             this.getNext().invoke(request, response, compositeValve);
             return;
         }
@@ -49,9 +49,9 @@ public class WebappAuthenticationHandler extends CarbonTomcatValve {
         this.processResponse(request, response, compositeValve, status);
     }
 
-    private boolean isNonAdminService(Request request) {
+    private boolean isAdminService(Request request) {
         String param = request.getContext().findParameter("isAdminService");
-        return !(param != null && Boolean.parseBoolean(param));
+        return (param != null && Boolean.parseBoolean(param));
     }
 
     private boolean skipAuthentication(Request request) {