ClickOnce Example not working

[Guest]

I tried implementing the simplest of ClickOnce Demos, a hello world app, and
tried to publish it using the Publish wizard, but I'm getting a message box
with "Application download did not succeed", and the dump below in the
details when I try to download the sample app from the publish.htm. Any idea
what is causing this? Seems like this should have been pretty simple.

PLATFORM VERSION INFO
Windows : 5.1.2600.131072 (Win32NT)
Common Language Runtime : 2.0.50727.42
System.Deployment.dll : 2.0.50727.42 (RTM.050727-4200)
mscorwks.dll : 2.0.50727.42 (RTM.050727-4200)
dfdll.dll : 2.0.50727.42 (RTM.050727-4200)
dfshim.dll : 2.0.50727.42 (RTM.050727-4200)

SOURCES
Deployment url :
http://pfcbelw17hlw21/ClickOnceTest/ClickOnceTest.application

ERROR SUMMARY
Below is a summary of the errors, details of these errors are listed
later in the log.
* Activation of
http://pfcbelw17hlw21/ClickOnceTest/ClickOnceTest.application resulted in
exception. Following failure messages were detected:
+ Downloading
http://pfcbelw17hlw21/ClickOnceTest/ClickOnceTest.application did not succeed.
+ The remote server returned an error: (400) Bad Request.

COMPONENT STORE TRANSACTION FAILURE SUMMARY
No transaction error was detected.

WARNINGS
There were no warnings during this operation.

OPERATION PROGRESS STATUS
* [7/24/2006 6:13:40 PM] : Activation of
http://pfcbelw17hlw21/ClickOnceTest/ClickOnceTest.application has started.

ERROR DETAILS
Following errors were detected during this operation.
* [7/24/2006 6:13:40 PM]
System.Deployment.Application.DeploymentDownloadException (Unknown subtype)
- Downloading
http://pfcbelw17hlw21/ClickOnceTest/ClickOnceTest.application did not succeed.
- Source: System.Deployment
- Stack trace:
at
System.Deployment.Application.SystemNetDownloader.DownloadSingleFile(DownloadQueueItem next)
at
System.Deployment.Application.SystemNetDownloader.DownloadAllFiles()
at
System.Deployment.Application.FileDownloader.Download(SubscriptionState
subState)
at
System.Deployment.Application.DownloadManager.DownloadManifestAsRawFile(Uri&
sourceUri, String targetPath, IDownloadNotification notification,
DownloadOptions options, ServerInformation& serverInformation)
at
System.Deployment.Application.DownloadManager.DownloadDeploymentManifestDirectBypass(SubscriptionStore
subStore, Uri& sourceUri, TempFile& tempFile, SubscriptionState& subState,
IDownloadNotification notification, DownloadOptions options,
ServerInformation& serverInformation)
at
System.Deployment.Application.DownloadManager.DownloadDeploymentManifestBypass(SubscriptionStore
subStore, Uri& sourceUri, TempFile& tempFile, SubscriptionState& subState,
IDownloadNotification notification, DownloadOptions options)
at
System.Deployment.Application.ApplicationActivator.PerformDeploymentActivation(Uri activationUri, Boolean isShortcut)
at
System.Deployment.Application.ApplicationActivator.ActivateDeploymentWorker(Object state)
--- Inner Exception ---
System.Net.WebException
- The remote server returned an error: (400) Bad Request.
- Source: System
- Stack trace:
at System.Net.HttpWebRequest.GetResponse()
at
System.Deployment.Application.SystemNetDownloader.DownloadSingleFile(DownloadQueueItem next)

COMPONENT STORE TRANSACTION DETAILS
No transaction information is available.