这个问题很久以前就解决了:
位于\WINNT\Microsoft.NET\Framework\v1.0.3705\CONFIG\machine.config  这个配置文件. 有****号者必须把默认设置改变  
                <processModel  
                        enable="true"  
                        timeout="Infinite"  
                        idleTimeout="Infinite"  
                        shutdownTimeout="0:00:05"    
                        requestLimit="Infinite"    
                        requestQueueLimit="5000"    
                        restartQueueLimit="10"  
                        memoryLimit="60"    
                        webGarden="false"  
                        cpuMask="0xffffffff"  
                        userName="system"                ****  '设置用户名,默认为"machine"必须改变它,你可以设置为服务器名或"system"  
                        password="AutoGenerate"      '设置登陆密码,建议保留默认值