SMP Control Manager detected SMP is not responding to HTTP requests

I got this error in the eventlogon the server  like every hour.
Is it critical and what to do to get rid of it?

Event Type:	Error
Event Source:	SMS Server
Event Category:	SMS_STATE_MIGRATION_POINT
Event ID:	6207
Date:		3/11/2008
Time:		6:48:04 AM
User:		N/A
Computer:	SCCM
Description:
On 03/11/08 06:48:04, component SMS_STATE_MIGRATION_POINT on computer SCCM reported:  SMP Control Manager detected SMP is not responding to HTTP requests.  The http status code and text is 500, Internal Server Error.
 
Possible cause: Internet Information Services (IIS) isn't configured to listen on the ports over which SMS is configured to communicate. 
Solution: Verify that the designated Web Site is configured to use the same ports which SMS is configured to use.
 
Possible cause: The designated Web Site is disabled in IIS. 
Solution: Verify that the designated Web Site is enabled, and functioning properly.
 
Possible cause: The SMS ISAPI Application Identity does not have the requisite logon privileges. 
Solution: Verify that the account that the SMS ISAPI is configured to run under has not been denied batch logon rights through group policy.
 
For more information, refer to Microsoft Knowledge Base.
 
 
For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.

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