Do Sharepoint timer jobs run under certain permissions?

[JonathanHerschel]

I have downloaded and installed the SharepointWarmUpJob written by Andrew Cohen [

http://code.msdn.microsoft.com/SharePointWarmupJob/Release/ProjectReleases.aspx?ReleaseId=1117

] on both my VM and Dev server and the job works great!, but after I deployed it to the production server, it fails. Since this is the production server, we do not have VS installed and cannot debug. I am getting the following errors which lead me to believe it may be a permission error? If any of the below errors are recognized by anyone, would appreciatte your advice

Event Viewer Log
Event Type: ErrorEvent Source: Windows SharePoint Services 3Event Category: Timer Event ID: 6398Date: 10/24/2008Time: 1:32:47 PMUser: N/AComputer: SP-WEB1Description:The Execute method of job definition MSDN.SharePoint.Samples.SharePointWarmupJob (ID 63fe1857-dd8d-4796-8ae5-f1877bbedb8c) threw an exception. More information is included below. The remote server returned an error: (401) Unauthorized.
For more information, see Help and Support Center at

http://go.microsoft.com/fwlink/events.asp.

[no help of course....]

SharePoint Log
Exception stack trace: at System.Net.HttpWebRequest.GetResponse() at MSDN.SharePoint.Samples.SharePointWarmupJob.WarmUpSiteCollection(SPSite siteCollection) at MSDN.SharePoint.Samples.SharePointWarmupJob.Execute(Guid targetInstanceId) at Microsoft.SharePoint.Administration.SPTimerJobInvoke.Invoke(TimerJobExecuteData& data, Int32& result)

Thanks,
JH