Event ID - 47

Event Id47
SourceW3SVC
DescriptionThe server certificate for instance 1 does not chain up to a trusted root certificate. For additional information specific to this message please visit the Microsoft Online Support site located at: http://www.microsoft.com/contentredirect.asp.
Event InformationAccording To Microsoft:
CAUSE:
This may happens if you have an in-house CA and generate and install a certificate in IIS but do not install the associated root certificate.

RESOLUTION : Open Internet Services Manager, select the instance in question and open its properties. Select the Directory Security tab. Click View Certificate. The certificate you have installed will have a red error "x" over it, and an error will be displayed that the certificate cannot be verified up to a trusted root. Select the certification path, click the root certificate and click the View Certificate button. Click on the Install Certificate button. This launches the Certificate Import Wizard. Follow the prompts taking the defaults.
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