Required Port 443 For Veeam Backup & Replication Is Occupied By Another Application Page

This is the most common fix.

Alternatively, if you don’t need the default website at all, stop and disable it: This is the most common fix

Stop-Website 'Default Web Site'
Set-ItemProperty 'IIS:\Sites\Default Web Site' -Name ServerAutoStart -Value $false

Now restart Veeam Backup Service.

System administrators and backup engineers with intermediate knowledge of Windows Server, networking, and Veeam. Alternatively, if you don’t need the default website

Though rare, attempting to run vCenter Server on the same Windows machine as Veeam will cause a port conflict because vCenter’s web client also uses 443. Now restart Veeam Backup Service

| 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 |

tasklist /fi "PID eq 1234"

Or in PowerShell:

Get-Process -Id 1234