If Veeam is installed on an Exchange Server (not recommended but sometimes done in small environments), Exchange’s front-end services (Outlook Web App, ECP, ActiveSync) listen on port 443.
If your Veeam server is also acting as a web server, IIS likely has a "Default Web Site" bound to 443.
Are you seeing this error during a or did it suddenly appear on an existing server ?
John tried to stop the Acme Secure Gateway service, but it wouldn't budge. He then tried to change the port used by Veeam Backup & Replication to a different one, but that would require updating the configuration on multiple servers, which would take some time.
