Ajax. NetFrameWork3.5 SYS does not have a solution defined

Problem Description:

Initially, the items above the 192.168.168.17 server are not accessible online. Later found only under the IE6 can not access, but in IE7 to normal access. Error message "SYS not defined" for Microsoft Ajax Framework

The following figure:

Problem solving:

1. Check the Web.config file under the site contains the following information:

<compilation debug= "true" >
<assemblies>
<add assembly= "System.Web.Extensions, version=3.5.0.0, culture=neutral, publickeytoken=31bf3856ad364e35"/>
</assemblies>
</compilation>
<pages>
<controls>
<add tagprefix= "asp" namespace= "System.Web.UI" assembly=, System.Web.Extensions, version=3.5.0.0 , publickeytoken=31bf3856ad364e35 "/>
<add tagprefix= "asp" namespace= "System.Web.UI.WebControls" assembly=, System.Web.Extensions, Culture=neutral, publickeytoken=31bf3856ad364e35 "/>
</controls>
</pages>
<remove verb= "*" path= "*.asmx"/>
<add verb= "*" path= "*.ashx" type= "ajaxpro.ajaxhandlerfactory,ajaxpro.2"/>
<add verb= "*" path= "*.asmx" validate= "false" Type= "System.Web.Script.Services.ScriptHandlerFactory, System.Web.Extensions, version=3.5.0.0, culture=neutral, publickeytoken=31bf3856ad364e35 "/>
<add verb= "*" path= "*_appservice.axd" validate= "false" Type= "System.Web.Script.Services.ScriptHandlerFactory, System.Web.Extensions, version=3.5.0.0, culture=neutral, publickeytoken=31bf3856ad364e35 "/>
<add verb= "Get,head" path= ScriptResource.axd "type=" System.Web.Handlers.ScriptResourceHandler, System.Web.Extensions, version=3.5.0.0, Culture=neutral, publickeytoken=31bf3856ad364e35 "validate=" false "/>
<add name= "Scriptmodule" type= "System.Web.Handlers.ScriptModule, System.Web.Extensions, version=3.5.0.0, Culture =neutral, publickeytoken=31bf3856ad364e35 "/>