After upgrading Exchange Server 2007 to SP3 with update rollup 13, OWA not working

Hi,
We have just installed Service Pack 3 and update rollup 13 on our Exchange Server 2007, but unfortunately our OWA has gone inaccessible.
PROBLEM- The following error comes up when we try to access OWA :
Exception
Exception type: Microsoft.Exchange.Clients.Owa.Core.OwaInvalidConfigurationException
Exception message: Object reference not set to an instance
of an object.
Call stack
Microsoft.Exchange.Clients.Owa.Core.OwaConfigurationManager.CreateAndLoadConfigurationManager()
Microsoft.Exchange.Clients.Owa.Core.Globals.InitializeApplication()
Microsoft.Exchange.Clients.Owa.Core.Global.ExecuteApplicationStart(Object sender, EventArgs e)
Inner Exception
Exception type: System.NullReferenceException
Exception message: Object reference not set to an instance
of an object.
Call stack
Microsoft.Exchange.Clients.Owa.Core.Configuration.CheckPublicFolders(ADSystemConfigurationSession session, ADObjectId[] pfdbIds, Boolean& allLegacy, Boolean& allLater)
Microsoft.Exchange.Clients.Owa.Core.Configuration..ctor(ADSystemConfigurationSession session, String virtualDirectory, String webSiteName, ADObjectId distinguishedName, Boolean isPhoneticSupportEnabled)
Microsoft.Exchange.Clients.Owa.Core.OwaConfigurationManager.LoadConfiguration()
Microsoft.Exchange.Clients.Owa.Core.OwaConfigurationManager.CreateAndLoadConfigurationManager()
ACTION TAKEN SO FAR :
1. Removed OWA virtual directories and recreated them again.
2. IIS has been reset.
3. Restarted the HUB/CAS server.
4. Created public folder database.
Even after doing all these activities, owa is still inaccessible. Please help.
Regards,
Ankur

Hi Ankur,
From your description, you can't access to OWA after upgrading Exchange server 2007 to SP3 rollup 13. Firstly, please locate to C:\ExchangeSetupLogs and make sure that it is a successful installation. If not, this issue often occurs.
If it is a successful upgrading, please follow the steps below for troubleshooting.
1. Open IIS Manager, click Default Web Site -> Authentication, make sure that Anonymous Authentication and Windows Authentication are enabled.
2. Click Default Web Site -> SSL Settings, check "Require SSL" and click Ignore.
3. Click Default Web Site -> HTTP Redirect, check Redirect (enter your 
https://URL), check "Only redirect" box and Status code Found 302.
4. Expand Server Configuration -> Client Access ->double click owa ->Authentication tab. Check the Basic Authentication and check the Use forms-based authentication button Logon Format: Domain\user name.
Hope it helps.
Best regards,
Amy Wang
TechNet Community Support

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