IIS 报错 Cannot open database "test4" requested by the login. The login failed. Login failed for user 'IIS APPPOOL\test1'.

报错：

　　Cannot open database "test4" requested by the login. The login failed. Login failed for user 'IIS APPPOOL\test1'.

$IIS 报错 Cannot open database "test4" requested by the login. The login failed. Login failed for user 'IIS APPPOOL\test1'.$

解决：

　　打开IIS -> 应用程序池 -> 选择对应的应用程序池 -> 高级设置 -> 标识（进程模型） -> 选择LocalSystem

$IIS 报错 Cannot open database "test4" requested by the login. The login failed. Login failed for user 'IIS APPPOOL\test1'.$