clients not reporting status after updating WSUS 2 to WSUS 3.0

After i upgraded to WSUS 3.0, my client computers are no longer reporting
status in WSUS. In console, they are all listed with yellow triangle and
exclamation point. How can i fix that?
Thank you!

This is from "windows update.log":
Windows Update Client failed to detect with error 0x80244019

Thank you!

[dreamsplc]

An HTTP '404' error, suggesting that the clients are pointed to the wrong
URL.

Describe to me the complete background of this WSUS server, and how it came
to be a WSUS 3.0 server.

[setca]

Thanks for reply, Lawrence

> What else is installed on this server?
>
> The most likely cause is a defect in the clients' ability to access the
> /selfupdate tree on the Default Web Site.

Server is W2K3 DC, Backup Exec 11d with SQL express 2005, Symantec AV 10 with System Mgr, HP Sys. Mgmt.

> > Exception message: The type
> > 'Microsoft.UpdateServices.Internal.Global' is ambiguous:
> > it could come from assembly
> > 'C:\Program Files\Update\Services\WebServices
> > \ClientWebService\bin\microsoft.updateservices.webservices.client.DLL'
> > or from assembly
> > 'C:\Program Files\Update
> > Services\WebServices\ClientWebService\bin\clientws.DLL'.

> This latter path ~\ClientWebService\bin\clientws.DLL is an invalid
> reference. This is the WSUS 2.0 library. Certainly this reference
> should
> have been authoritatively resolved after a successful upgrade.


I while back I forced out WSUS 2 but the reference is not in the registry.
is it in a .net config file?
I checked the file, and clientws.DLL is ver. 2 dated 5/26/2006!
It must have been leftover.
Can I fix this, or need to uninstall,
delete 'C:\Program Files\Update Services\' and reinstall?

Thanks again.

[setca]

I removed WSUS3, deleted c:\program files\update sevices ,
and deleted all clientws.DLL

clientws.DLL ver.2 was in deep subfolder of:
C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\Temporary ASP.NET Files\clientwebservice\21f2d155\...

clientws.DLL ver.3 was in deep subfolder of:
C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\Temporary ASP.NET Files\clientwebservice\48cba74c\...


I reinstalled WSUS3 successfully.

The console shows clients reporting with last date/time, but the updates show as installed/not applicable , or updates with no status. no clients show any updates needed, but they are not current. No clients show a yellow exclamation.
I tried the client fix on a few- remove susclid reg entries, restart wuau.
I think I have sufficient permissions on the server.
Anything to check on server or clients?

[setca]

All appears well. clients started reporting ater the client fix.
Thank you all contributors.