Required Port 443 For Veeam Backup Replication Is Occupied By Another Application Link -

Locate the line displaying LISTENING . The number at the far right of that row is the .

Before you can fix the issue, you must determine which application is currently listening on port 443. You can do this via the Command Line or PowerShell.

Get-Process -Id (Get-NetTCPConnection -LocalPort 443).OwningProcess

He clicked the "Details" link, his eyes scanning the error log until they locked onto the fatal sentence: Locate the line displaying LISTENING

The phrase “occupied by another application link” in the error message is simply a sign that the Windows operating system is reporting that a program has already created a network listener on TCP port 443. This conflict is rarely a single type of application. The usual suspects in a Windows environment are:

If the application occupying port 443 is non-essential or can use a different port, change it.

: A frequent cause is the Hyper-V Replica service on the same server. An "easy fix" reported in Veeam R&D Forums involves changing the Hyper-V replication port from 443 to another value (e.g., 444) before proceeding with the Veeam upgrade. You can do this via the Command Line or PowerShell

netstat -ano | findstr :443

Identify the program name by running this command (replace [PID] with your actual number): tasklist /fi "pid eq [PID]" Use code with caution. Method B: Using PowerShell

After making changes, confirm that Veeam successfully claims the port or that the conflict is cleared. Restart the Veeam Backup Service via services.msc . Run the netstat command again: netstat -ano | findstr :443 Use code with caution. The usual suspects in a Windows environment are:

Open an administrative Command Prompt or PowerShell window and run:

Get-NetTCPConnection -LocalPort 443 | Select-Object LocalAddress, LocalPort, OwningProcess, State | Format-Table Use code with caution.

In Veeam Backup & Replication (VBR) v13, is a hardcoded requirement for the REST API and Web UI services. If this port is occupied by another application during installation or upgrade, the Veeam services will fail to bind and start. Identifying the Conflicting Application