try to modify httpRuntime element, set larger minFreeThreads/minFreeLocalRequestFreeThreads/appRequestQueueLimit <configuration> <system.web> <httpRuntime maxRequestLength="4000" useFullyQualifiedRedirectUrl="true" executionTimeout="45"/> </system.web> </configuration> use performance monitor to monitor your serverhttp://www.microsoft.com/technet/treeview/default.asp?url=/technet/prodtechnol/windowsserver2003/proddocs/standard/aaconmonitoringaspnetwebapplications.asphttp://www.microsoft.com/technet/treeview/default.asp?url=/technet/prodtechnol/windowsserver2003/proddocs/standard/aaconperformancecountersforaspnet.asp
<!-- 指示 ASP.NET 支持的最大文件上载大小。
该限制可用于防止因用户将大量文件传递到该服务器而导致的拒绝服务攻击。
指定的大小以 KB 为单位。默认值为 4096 KB (4 MB)。
此处改为40M大小的文件上传限制。
-->
<httpRuntime maxRequestLength = "40960" useFullyQualifiedRedirectUrl="true"/>
</system.web>
<configuration>
<system.web>
<httpRuntime maxRequestLength="4000"
useFullyQualifiedRedirectUrl="true"
executionTimeout="45"/>
</system.web>
</configuration>
use performance monitor to monitor your serverhttp://www.microsoft.com/technet/treeview/default.asp?url=/technet/prodtechnol/windowsserver2003/proddocs/standard/aaconmonitoringaspnetwebapplications.asphttp://www.microsoft.com/technet/treeview/default.asp?url=/technet/prodtechnol/windowsserver2003/proddocs/standard/aaconperformancecountersforaspnet.asp
如果是用服务器版本的windows操作系统,则你的网站访问量太大了,优化一下代码吧