Do not guess. Use Windows built-in tools:
If you have both Veeam Backup & Replication and Veeam Enterprise Manager on the same machine (not typical for performance reasons): Do not guess
Various unified communications components reserve port 443 for media and signaling. When you install Veeam Backup & Replication (version
To understand the error, one must first appreciate that Veeam Backup & Replication is not just a file-copy tool—it is a distributed, web-centric platform. Port 443 is the default port for: | Application / Service | Typical Process Name
When you install Veeam Backup & Replication (version 10, 11, 12, or later), the installer attempts to bind the Veeam Backup Service to port TCP 443 on the local machine. If any other process has already claimed that port—even if it's just listening and not actively serving traffic—Veeam will refuse to start or install.
Get-NetTCPConnection -LocalPort 443 | Select-Object -Property LocalAddress, LocalPort, State, OwningProcess
Get-Process -Id (Get-NetTCPConnection -LocalPort 443).OwningProcess
| Application / Service | Typical Process Name |
|----------------------|----------------------|
| IIS (Default Web Site) | w3wp.exe, inetinfo.exe |
| Skype / Teams (sharing HTTPS) | skype.exe, teams.exe |
| SQL Server Reporting Services (SSRS) | ReportingServicesService.exe |
| Apache / Nginx (if manually installed) | httpd.exe, nginx.exe |
| Veeam previously installed incorrectly | Veeam.Backup.Satellite.Service.exe (misconfiguration) |
| Docker Desktop (Kubernetes) | com.docker.backend.exe |
| Any service using netsh http show urlacl reservations | Varies |