Cannot connect to exchange server or OWA with Http Event 15021

Cannot connect to exchange server or OWA with Http Event 15021

Microsoft-Windows-HttpEvent – Event ID: 15021

An error occurred while using SSL configuration for endpoint 0.0.0.0:443. The error status code is contained within the returned data.

This error is because the SSL certificate is not binded to the Exchange site properly. This will stop outlook being able to connect to exchange and also if you browse to OWA or ECP you will just get a 404 error.

To fix this:

  • Open IIS Manager
  • Expand your <server name>
  • Expand Sites
  • Select “Default Web Site
  • On the Actions Pane select Bindings

Select bindings to fix exchange server

 

  • Under the Site Bindings open both https entries and add the certificate to the site

add certificate ssl small

 

Now go to your desktop and open outlook. Now you will be connected to your exchange server and be able to send and receive emails.

all folders up to date exchange

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