今天上網(wǎng)站發(fā)現(xiàn)提示服務(wù)器連接超時,然后我去服務(wù)器看了一下,沒問題啊.我在本地寫了一個測試程序,也就是簡單的增刪改查,確實可以連上服務(wù)器上的數(shù)據(jù)庫.我重啟了一下服務(wù)器,發(fā)現(xiàn)還是不行.提示如下:Server Error in '/' Application.用戶 'sa' 登錄失敗。Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System.Data.SqlClient.SqlException: 用戶 'sa' 登錄失敗。Source Error: An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.請問是什么原因?怎么解決