When you browse a Windows SharePoint Services 3.0 site collection, you cannot access the site collection as expected. Instead, you receive an HTTP 404 error message. Additionally, you experience the following symptoms:

- The following error message is logged in the Application log on the server that is running SharePoint Services 3.0:
Event Type: Error
Event Source: Windows SharePoint Services 3
Event Category: Topology
Event ID: 6800
Date: date

Time: time
User: N/A
The database WSS_Content on computer_name\Microsoft##SSEE is not accessible to missing Windows Internal Database signatures.

- You receive an error message in the upgrade log that resembles the following:
[SPServerSequence] [DEBUG] [date time]: Web service Instance SPWebServiceInstance Parent=SPServer Name=computer_name not added. Status = Provisioning

Finally, you may also receive one of the following error messages:
Access to the table dbo.sites is blocked because the signature is not valid
Access to module dbo.proc_GetCurrent is blocked because the signature is not valid.

This problem occurs after a hotfix package or a public update for Windows SharePoint Services 3.0 is applied


This problem occurs if the SPWebService service has not been fully provisioned.


To resolve this problem, follow these steps:
1. Click Start, click Run, type cmd in the Open box, and then click OK.
2. Change to the following directory:
system drive
Program Files\Common Files\Microsoft Shared\Web Server Extensions\12\Bin
3. At the command prompt, type the following command, and then press ENTER to stop the SPWebService service:
stsadm -o provisionservice -action stop -servicetype spwebservice -servicename ""
4. After the SPWebService service has stopped, type the following command, and then press ENTER to start the SPWebService service:
stsadm -o provisionservice -action start -servicetype spwebservice -servicename ""
5. After the SPWebService service is started, type the following command to complete the hotfix process or the update process:
psconfig -cmd upgrade -inplace b2b -wait -force