Cannot access */ext.axd resources, how to set permission for .axd resources?

Problems:

Cannot access */ext.axd resources, it always redirect to login page with http code 302.

My Environment:

1. Window Server 2008 R2
2. IIS 7.5
3. NET Framework 4.0
4. WebForms

My IIS Configuration:

1. Only enabled Form Authentication
2. Handler Mapping already created  

<validation validateIntegratedModeConfiguration="false" /><modules runAllManagedModulesForAllRequests="true"><add name="DirectRequestModule" preCondition="managedHandler" type="Ext.Net.DirectRequestModule, Ext.Net" /></modules><handlers accessPolicy="Read, Script"><add name="DirectRequestHandler" path="*/ext.axd" verb="*" type="Ext.Net.ResourceHandler" resourceType="Unspecified" requireAccess="Script" preCondition="integratedMode" /></handlers>

Request Screenshot:

Thanks