It could be that the user identity is outdated, especially if you've tried starting a stopped app pool and the next request again fails.
(可能是用户身份已过时,特别是如果您尝试启动已停止的应用程序池并且下一个请求再次失败。)
In IIS, go to the Application Pools under the Server, then find the correct Application Pool for your web site, and click on it.
(在IIS中,转到“服务器”下的“应用程序池”,然后为您的网站找到正确的应用程序池,并单击它。)
On the Advanced Settings menu to the right, select Identity and change it and enter new user and password. (在右侧的“高级设置”菜单中,选择“身份”并进行更改并输入新用户和密码。)
Click on your Application Pool again, and select Recycle to restart it. (再次单击您的应用程序池,然后选择Recycle以重新启动它。)
You can also try looking at the error message in Event Viewer, under Windows Logs, Application, Details tab.
(您还可以尝试在“事件查看器”中的“Windows日志”,“应用程序”,“详细信息”选项卡下查看错误消息。)
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