Cannot connect to exchange server or OWA with Http Event 15021

< All Topics
Print

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 bound 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.

 

 

Typically this happens following the next reboot after applying a new certificate to exchange. The event log will be full of these errors.

The solution is as follows:

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

 

 

 

 

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

 

 

 

 

 

 

 

 

 

Outlook , ECP and OWA should now be working

Table of Contents

Ready to Take the Stress Out of Your IT?

Book a free, no-obligation consultation with one of our friendly experts.
Let’s explore how we can support your business with reliable IT services, robust cybersecurity, and full compliance — all tailored to you.

  • No hard sell — just expert advice
  • Tailored to your business needs
  • Trusted by businesses across Yorkshire
Book Your Free Intro Call Now

Stay informed with the latest IT tips, cybersecurity advice, and exclusive resources.

Consent(Required)
This field is for validation purposes and should be left unchanged.
Andisa IT - Leading Managed  Service Provider in Yorkshire, serving Harrogate, Leeds, York, and surrounding areas.