// Should not affect IP limiting
        rateLimiter.recordFailure(null, "192.168.1.8");
        assertTrue(rateLimiter.checkAttempt("realuser", "192.168.1.8"), "Should still track IP");
    }

    @Test
    public void testNullIp() throws Exception {
        // Null IP should be handled gracefully

		// load polices mapped to users
		if err := store.loadMappedPolicies(ctx, regUser, false, newCache.iamUserPolicyMap); err != nil {
			return err
		}

		bootstrapTraceMsgFirstTime("loading group policy mapping")
		// load policies mapped to groups
		if err := store.loadMappedPolicies(ctx, regUser, true, newCache.iamGroupPolicyMap); err != nil {
			return err
		}

		regUsersLoadStartTime := UTCNow()
		regUsersList := listedConfigItems[usersListKey]

		for {
			if len(regUsersList) < count {
				users, err := iamOS.loadUserConcurrent(ctx, regUser, regUsersList...)
				if err != nil {
					return err
				}
				for index := range regUsersList {
					if users[index].Credentials.AccessKey != "" {
						userName := path.Dir(regUsersList[index])

	updatedAt, addedOrRemoved, effectivePolicies, err = sys.store.PolicyDBUpdate(ctx, userOrGroup, isGroup,
		regUser, r.Policies, isAttach)
	if err != nil {
		return
	}

	// Notify all other MinIO peers to reload policy
	if !sys.HasWatcher() {
		for _, nerr := range globalNotificationSys.LoadPolicyMapping(ctx, userOrGroup, regUser, isGroup) {
			if nerr.Err != nil {

		Groups:   true,
	})
	if err != nil {
		return err
	}
	for policy := range info.PolicyStats {
		c.healPolicies(ctx, objAPI, policy, info)
	}
	for user := range info.UserStats {
		c.healUsers(ctx, objAPI, user, info)
	}
	for group := range info.GroupStats {
		c.healGroups(ctx, objAPI, group, info)
	}
	for user := range info.UserStats {
		c.healUserPolicies(ctx, objAPI, user, info)
	}

		}
	} else {
		_, err := globalIAMSys.GetGroupDescription(entityName)
		if err != nil {
			writeErrorResponseJSON(ctx, w, toAdminAPIErr(ctx, err), r.URL)
			return
		}
	}

	userType := regUser
	if globalIAMSys.GetUsersSysType() == LDAPUsersSysType {
		userType = stsUser

		// Validate that the user or group exists in LDAP and use the normalized
		// form of the entityName (which will be an LDAP DN).