< identity impersonate="true" userName="" password=""/>
ASP.NET 2.0 以上：
C:WINDOWSMicrosoft.NETFrameworkv2.0.50727CONFIGweb.config
设置：
< identity impersonate="true"/>
如果没有此两项，分别进行增加：
< location allowOverride="true"> 改为：< location allowOverride="false">
< system.web>
< securityPolicy>
< trustLevel name="Full" policyFile="internal"/>
< trustLevel name="High" policyFile="web_hightrust.config"/>
< trustLevel name="Medium" policyFile="web_mediumtrust.config"/>
< trustLevel name="Low" policyFile="web_lowtrust.config"/>
< trustLevel name="Minimal" policyFile="web_minimaltrust.config"/>
< /securityPolicy>
< trust level="Full" originUrl=""/>
< identity impersonate="true"/> < !-- 这里增加 -->
< /system.web>
< /location>
