RadUpload Ajax Callback error- Source control retured error- 503

[kapil sharma]

When my App page is open for like 1- 3 hours, then Below error comes :-

RadUpload Ajax callback error. Source url returned error: 503
Service Unavailable

../Relerik.RadUploadProgressHandler.ashx?RadUrid=543c70bc -aebe-47f8-9c29-166dea518b11

Did yoiu register the RadUploadProgressHandler in web.config ?

Please, see the help for more details: RadUpload for ASP.NET Ajax -Configuration -RadUploadProgressHandler.

-------------------------------------------------------------------------------------------------------------------------------
Even I have Register this handler. My code in webconfig for adding handler is :-

<httpHandlers>
<remove verb="*" path="*.asmx"/>
<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 path="ChartImage.axd" type="Telerik.Web.UI.ChartHttpHandler" verb="*" validate="false"/>
<add path="Telerik.Web.UI.SpellCheckHandler.axd" type="Telerik.Web.UI.SpellCheckHandler" verb="*" validate="false"/>
<add path="Telerik.Web.UI.DialogHandler.aspx" type="Telerik.Web.UI.DialogHandler" verb="*" validate="false"/>

<add path="Telerik.RadUploadProgressHandler.ashx" type="Telerik.Web.UI.RadUploadProgressHandler" verb="*" validate="false"/>

<add path="Telerik.Web.UI.WebResource.axd" type="Telerik.Web.UI.WebResource" verb="*" validate="false"/>
</httpHandlers>


I would really appreciate if someone could help to resolve this issue.

Thanks in advance....
Kapil Sharma