Required Port 443 For Veeam Backup & Replication Is Occupied By Another Application May 2026

Veeam Backup Server does not natively support changing its main HTTPS port from 443 without breaking components. However, you can:

If you absolutely cannot free port 443 due to corporate policy (e.g., another critical application must keep it), you can force Veeam to use a different port. However, this is not officially recommended because:

Still, if necessary:

You will also need to adjust firewall rules accordingly.

Get-NetTCPConnection -LocalPort 443 | Select-Object -Property LocalAddress, LocalPort, State, OwningProcess
Get-Process -Id (Get-NetTCPConnection -LocalPort 443).OwningProcess

If after following all steps the port remains occupied by an unidentified or protected service, you may need to: Veeam Backup Server does not natively support changing

There are two main paths to resolve this: Change the Competitor (Recommended) or Change Veeam (Advanced).

tasklist /fi "PID eq 1234"

Or in PowerShell:

Get-Process -Id 1234

$port = 443
$connections = netstat -ano | select-string ":$port "
if ($connections) 
    Write-Host "Port $port is in use:" -ForegroundColor Red
    $connections  else 
    Write-Host "Port $port is free." -ForegroundColor Green

Before resolving the issue, it is helpful to identify which application is currently holding the port. Common applications that bind to Port 443 on Windows Server include: