"Case sharing" Exchange 2013 login Ecp\owa error, event log error 15021

Environment: Dc+exchange 2013 (front and back)
Fault:

1. Login ECP, OWA, unable to display the page error
2.EMS Unable to connect to server, error

Exclusion Method:

Check the status of the service is normal, view the event log, found a large heap of httpevent 15021 error, view the IIS virtual directory, found IIS default virtual directory 443 is not bound certificate, Exchange back end Virtual Directory page is not bound certificate.

Solution:

In IIS Manager, edit the bound virtual directory to bind the certificate.

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"Case sharing" Exchange 2013 login Ecp\owa error, event log error 15021