Runtime Error---Description: An application error occurred on the server....

Description: An application error occurred on the server. The current custom error settings for this application prevent the details of the application error from being viewed remotely (for security reasons). It could, however, be viewed by browsers running on the local server machine.

Details: To enable the details of this specific error message to be viewable on remote machines, please create a <customErrors> tag within a "web.config" configuration file located in the root directory of the current web application. This <customErrors> tag should then have its "mode" attribute set to "Off".

<!-- Web.Config Configuration File -->

<configuration>
<system.web>
<customErrors mode="Off"/>
</system.web>
</configuration>

Notes: The current error page you are seeing can be replaced by a custom error page by modifying the "defaultRedirect" attribute of the application's <customErrors> configuration tag to point to a custom error page URL.

<!-- Web.Config Configuration File -->

<configuration>
<system.web>
<customErrors mode="RemoteOnly" defaultRedirect="mycustompage.htm"/>
</system.web>
</configuration>

程序在本机上运行是正确的，放在服务器上出现这个问题

解决：出现此问题我目前遇到过两类：

1、程序是2.0此时在服务器端置，选择控制面版－－IIS－－选择网站名称－－右击属性－－ASP.NET查看版本是否是2.0，如果不是选择修改后OK。

2、放置系统的服务器本身出现问题并调试后，发现<解决1>的方法都正常，但问题还是报错，此时需要重要配置下网站，可以将原有网站移除后重新设置一下一般就OK。

这是我遇到出现此类问题的两次，大部分还是第一种。