Scenario: After upgrading our Exchange environment to CU8, users were reporting that they were unable to connect to their mailbox. After investigation, it was narrowed down that only a few servers were showing this issue, and other recently updated servers were working fine.
- Outlook Anywhere was showing as disconnected.
- OWA was taking mailboxes to a blank white page.
- Mobile Devices were reporting that there were issues connecting to the server
- Failure to connect to the Exchange Management Shell
- Multiple events in the System Log of the affected servers: Event ID 15021 (Source: HttpEvent): An error occurred while using SSL configuration for endpoint 0.0.0.0:444. The error status code is contained within the returned data.
Cause/Resolution: The problem was found to be that the Exchange Back End virtual directory in IIS was no longer bound to a SSL certificate; thus users were not able to establish a connection to their mailboxes.
- Open IIS Manager
- Expand the Server Name –> Sites.
- Right click on the Exchange Back End site.
- Click on Edit Bindings.
- Edit the entry for https port 444.
- Select a valid SSL vertificate from the list. A certificate needs to be set and this was set to none and was causing the issue.
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