diff --git a/api/apiclient/client.go b/api/apiclient/client.go
index a81a17e..d7451c5 100644
--- a/api/apiclient/client.go
+++ b/api/apiclient/client.go
@@ -18,6 +18,10 @@ type Client interface {
 	Monitor() (monitor.MonitorService_MonitorClient, error)
 	// IsClosed is connection closed of the current client
 	IsClosed(err error) bool
+	// IsUnauthenticated check whether the error is unauthorized
+	IsUnauthenticated(err error) bool
 	// SubscribeTask register a task client to the task server and wait to receive task
 	SubscribeTask(clientInfo *task.ClientInfo) (task.TaskService_SubscribeTaskClient, error)
+	// Login login to the server
+	Login() (err error)
 }
diff --git a/api/apiclient/grpc_client.go b/api/apiclient/grpc_client.go
index f563a63..1982723 100644
--- a/api/apiclient/grpc_client.go
+++ b/api/apiclient/grpc_client.go
@@ -53,7 +53,7 @@ func (c *client) Start() (err error) {
 	if err = c.connect(); err != nil {
 		return err
 	}
-	return c.login()
+	return c.Login()
 }
 
 func (c *client) connect() (err error) {
@@ -89,10 +89,10 @@ func (c *client) getInfo() (*info.FileServerInfo, error) {
 
 func (c *client) GetInfo() (*info.FileServerInfo, error) {
 	fsi, err := c.getInfo()
-	if !c.needLogin(err) {
+	if !c.IsUnauthenticated(err) {
 		return fsi, err
 	}
-	if err = c.login(); err != nil {
+	if err = c.Login(); err != nil {
 		return nil, err
 	}
 	return c.getInfo()
@@ -104,10 +104,10 @@ func (c *client) monitor() (monitor.MonitorService_MonitorClient, error) {
 
 func (c *client) Monitor() (monitor.MonitorService_MonitorClient, error) {
 	fsi, err := c.monitor()
-	if !c.needLogin(err) {
+	if !c.IsUnauthenticated(err) {
 		return fsi, err
 	}
-	if err = c.login(); err != nil {
+	if err = c.Login(); err != nil {
 		return nil, err
 	}
 	return c.monitor()
@@ -117,16 +117,20 @@ func (c *client) IsClosed(err error) bool {
 	return status.Code(err) == codes.Unavailable
 }
 
+func (c *client) IsUnauthenticated(err error) bool {
+	return status.Code(err) == codes.Unauthenticated
+}
+
 func (c *client) subscribeTask(clientInfo *task.ClientInfo) (task.TaskService_SubscribeTaskClient, error) {
 	return c.TaskServiceClient.SubscribeTask(context.Background(), clientInfo, grpc.PerRPCCredentials(c.creds))
 }
 
 func (c *client) SubscribeTask(clientInfo *task.ClientInfo) (task.TaskService_SubscribeTaskClient, error) {
 	rc, err := c.subscribeTask(clientInfo)
-	if !c.needLogin(err) {
+	if !c.IsUnauthenticated(err) {
 		return rc, err
 	}
-	if err = c.login(); err != nil {
+	if err = c.Login(); err != nil {
 		return nil, err
 	}
 	return c.subscribeTask(clientInfo)
@@ -144,11 +148,7 @@ func (c *client) getToken() (token string, err error) {
 	return reply.Token, nil
 }
 
-func (c *client) needLogin(err error) bool {
-	return status.Code(err) == codes.Unauthenticated
-}
-
-func (c *client) login() (err error) {
+func (c *client) Login() (err error) {
 	token, err := c.getToken()
 	if err == nil {
 		oauth2Token := oauth2.StaticTokenSource(&oauth2.Token{AccessToken: token})
diff --git a/monitor/remote_client_monitor.go b/monitor/remote_client_monitor.go
index 1398565..177e6f4 100644
--- a/monitor/remote_client_monitor.go
+++ b/monitor/remote_client_monitor.go
@@ -149,9 +149,18 @@ func (m *remoteClientMonitor) readMessage(st *atomic.Bool, wd wait.Done) {
 					nmc, err := m.client.Monitor()
 					if err == nil {
 						mc = nmc
+						m.logger.Info("monitor the remote server success")
 					}
 					return err
 				}, "monitor the remote server")
+			} else if m.client.IsUnauthenticated(err) {
+				if m.logger.ErrorIf(m.client.Login(), "re-login to remote server error") == nil {
+					m.logger.Info("re-login to remote server success")
+					if nmc, err := m.client.Monitor(); err == nil {
+						mc = nmc
+						m.logger.Info("monitor the remote server success")
+					}
+				}
 			}
 		} else {
 			m.messages.PushBack(msg)