After a while the browser returns this:

Altiris Notification Server Error

The following error occurred on the page 'OfflineClientTaskPolicy.aspx':

Unknown or unspecified error.

Same problem here, and it's been reported.  I also had to uninstall and reinstall for an unrelated issue and this particular issue still remain after that.  I did not have this problem with the RC.

I have no idea why, but my "Collect Delta" inventory policies work fine.  So I tried just creating a new inventory policy and that works.  I think I'll just create a new policy for "Collect Full Inventory" and "Collect Full Server Inventory" and get rid of the ones that aren't working.

I take it back.  The new inventory policies that I had created are no longer loading and, nor are any of the others.  The success that I was having was momentary thing.  I'm back to the same eventual timeout while loading the policies, with the message that says "The following error occurred on the page 'OfflineClientTaskPolicy.aspx'.

The Log Viewer shows two

Log File Name: C:\Program Files\Altiris\Notification Server\Logs\a.log
Priority: 1
Date: 09/28/2009 3:43:24 PM
Tick Count: 122374578
Host Name: altirisservername
Process: AeXSvc (7776)
Thread ID: 69
Module: AeXSVC.exe
Source: Altiris.NS.ClientMessaging.FileDispatcher.ProcessFileCallback
Description: Unable to process the file "C:\Program Files\Altiris\Notification Server\NSCap\EvtQFast\Process\hziimd4f.nse" Moving to "C:\Program Files\Altiris\Notification Server\NSCap\EvtQFast\Bad\AeXException\1c2a082a-cef9-48df-9dee-7690ac75f7b4.nse". Reason: failed to process message invalid xml - expecting message/from/resource or message/body/inventory/resources or XmlInventory

Followed by:

Log File Name: C:\Program Files\Altiris\Notification Server\Logs\a.log
Priority: 1
Date: 09/28/2009 3:43:24 PM
Tick Count: 122374578
Host Name: altirisservername
Process: AeXSvc (7776)
Thread ID: 69
Module: AeXSVC.exe
Source: Altiris.NS.ClientMessaging.FileDispatcher.ProcessFileCallback
Description: Unable to process the file "C:\Program Files\Altiris\Notification Server\NSCap\EvtQFast\Process\hziimd4f.nse" Moving to "C:\Program Files\Altiris\Notification Server\NSCap\EvtQFast\Bad\AeXException\1c2a082a-cef9-48df-9dee-7690ac75f7b4.nse". Reason: failed to process message invalid xml - expecting message/from/resource or message/body/inventory/resources or XmlInventory

I also see an ASP.NET warning in the Application Log when this happens:

Event code: 3001
Event message: The request has been aborted.
Event time: 9/28/2009 3:43:34 PM
Event time (UTC): 9/28/2009 8:43:34 PM
Event ID: a447af23ed424bba8d03883291ce1c6f
Event sequence: 4
Event occurrence: 1
Event detail code: 0
 
Application information:
    Application domain: /LM/W3SVC/1/Root/Altiris/Inventory-7-128986436116472555
    Trust level: Full
    Application Virtual Path: /Altiris/Inventory
    Application Path: C:\Program Files\Altiris\Inventory\Web\
    Machine name: altirisservername
 
Process information:
    Process ID: 8772
    Process name: w3wp.exe
    Account name: NT AUTHORITY\NETWORK SERVICE
 
Exception information:
    Exception type: HttpException
    Exception message: Request timed out.
 
Request information:
    Request URL: http://altirisservername/Altiris/Inventory/Policie... 3:43:34 PMaThe request has been aborted.fThe request has been aborted.fawh-smp-ns01The request has been aborted.faltirisThe request has been aborted.fconsoleThe request has been aborted.ftree.aspx9/28/2009 3:43:34 PMfTreeGuid9/28/2009 3:43:34 PMd15ce669d-efdb-483b-9e2c-7e3aafc88093
ConsoleGuid9/28/2009 3:43:34 PMd1b22db4e-a898-443f-9b99-855b1653d3f5&ConsoleGuid=1b22db4e-a898-443f-9b99-855b1653d3f5&ParentGuid=00000000-0000-0000-0000-000000000000
    Request path: /Altiris/Inventory/Policies/OfflineClientTaskPolicy.aspx

I really don't know what's going on.

Here's the KB article:
https://kb.altiris.com/article.asp?article=49357&p=1

There should be an interim solution to this soon.

I installed the hotfix attached to the KB article and rebooted my Notification Server.
The result is that the "Collect Full..." policies now work.
The "Collect Delta..." policies still returns the same error.
Br, Mikkel

 Same here.  I've installed the hotfix from KB49357 and that resolved the timeout for a week or so.  Now, my delta inventory pages load but the full inventory throws the error described above.

Symantec Support suggested I had not designated a Software Library UNC path but that was not the case.

They then advised the following:

 Update here - Symantec advised of KB50182 with sql procedure to resolve this.  Worked for me.  Caveat is that I know have a total maximum of 98% for compliance rather than 100% (see kb for details).

https://kb.altiris.com/display/1n/kb/article.asp?aid=50182