大俠請幫忙， 謝謝

我有兩台機共享其中一台的一個硬盤分區，可是忽然從某一天開始，我就不可以MAP 這個network drive 了。其錯誤信息是：“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 另一台機的IP地址。大俠們，求教了。謝謝