If the application occupying the port is not needed on your Veeam Backup server, the cleanest solution is to remove it.
Get-Process -Id 1234
Remember: Port 443 is a precious resource on any Windows server. Treat it as such, dedicate Veeam to its own machine wherever possible, and always perform a port audit before installation or upgrade. Your backups—and your peace of mind—depend on it. If the application occupying the port is not