大侠请帮忙， 谢谢

我有两台机共享其中一台的一个硬盘分区，可是忽然从某一天开始，我就不可以MAP 这个network drive 了。其错误信息是：“The mapped network drive could not be created because the following error has occurred: There are currently no logon servers available to service the logon request.” 但是我可以ping 到 另一台机的IP地址。大侠们，求教了。谢谢