Portal Web Site Control Manager detected PORTALWEB is not responding to HTTP requests. The http error is %1.%12 Possible ...

%11Portal Web Site Control Manager detected PORTALWEB is not responding to HTTP requests.  The http error is %1.%12

Possible cause: IIS service is not responding. 
Solution: Manually restart the W3SVC service on the PORTALWEB.

For more information, refer to Microsoft Knowledge Base article 838891.
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