diff --git a/drivers/ftp/ftp.go b/drivers/ftp/ftp.go
index f41f99a9..e3f7353b 100644
--- a/drivers/ftp/ftp.go
+++ b/drivers/ftp/ftp.go
@@ -11,7 +11,12 @@ var connMap map[string]*ftp.ServerConn
 func (driver FTP) Login(account *model.Account) (*ftp.ServerConn, error) {
 	conn, ok := connMap[account.Name]
 	if ok {
-		return conn, nil
+		_, err := conn.CurrentDir()
+		if err == nil {
+			return conn, nil
+		} else {
+			delete(connMap, account.Name)
+		}
 	}
 	conn, err := ftp.Connect(account.SiteUrl)
 	if err != nil {