Definition Updates not working TMG ?

In the TMG i am unable to download updates for malware inspections in the update center. When i click Install or check for new updates it always FAILS.
i get the following error under the Alerts:-
An error occurred during an attempt to check for, download, or install definition updates on the server isa-proxy. The failure is due to error: 0x80244018
In the event viewer i get the foloowing error:-
Log Name:      Application
Source:        Microsoft Forefront TMG Update Agent
Date:          19/02/2009 15:44:15
Event ID:      23450
Task Category: None
Level:         Error
Keywords:      Classic
User:          N/A
Computer:      isa-proxy.BM.com
Description:
An error occurred during an attempt to check for, download, or install definition updates on the server isa-proxy.

I have set up the settings as decribed below:-
http://technet.microsoft.com/en-us/library/cc995320.aspx

I am still using the 3 month trial version for the malware. can it be a lincense issue.?

Any Idea why its failing ?
WannabeNerdAsked:
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WannabeNerdAuthor Commented:
Thanks Keith,
Turned out that i had to add the INTERNAL NETWORK under Microsoft Updates Sites in System policy editor. Seems it was not talking to my WSUS server.
Now sure why it worked now and why didnt it work when i created an access rule from Local Host to Internal Allowing all traffic.
Strange, anyway sorted !
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Keith AlabasterEnterprise ArchitectCommented:
http://support.microsoft.com/kb/896226 - have you reviewed this also?
I doubt it is a license issue - unless you have a beta version in which case it 'may' be the cause in the sense it restricts any changes to the environment.
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Keith AlabasterEnterprise ArchitectCommented:
You want to kick someone then.....
Internal is automatically enabled for those MS sites within the System Policy specifically because of wsus updates etc. Access policies are over-ruled by System Policies. ie System policies are god - firewall rules are God's little helpers :)
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