Required Port 443 For Veeam Backup & Replication Is Occupied By Another Application 【INSTANT × SECRETS】

If you cannot change the port of the other application, you can reconfigure Veeam to use a different port for its web UI or API components during installation or via the registry/configuration files.

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

If the error message does not specify which application is holding the port, you can identify it using Windows built-in tools.

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. because:

Since Veeam v13 does not currently support changing the web service port via the installer, you must resolve the conflict at the source. Solution A: Reconfigure the Competing Service If you cannot change the port of the

: Run the following command: netstat -ano | findstr :443

If the conflicting application is unnecessary on your Veeam backup server (e.g., IIS or VMware Workstation), stop it. Press Win + R , type services.msc , and press .

This error typically occurs during an upgrade to or later, where port 443 is now hardcoded for the REST/Web UI service. Because this port is required and cannot be changed within Veeam's current supported configuration, you must identify and relocate the conflicting application. 1. Identify the Conflicting Application

In your elevated command shell, terminate the blocking process using the command: taskkill /F /PID Use code with caution. because: Since Veeam v13 does not currently support

will fail to start, potentially blocking your upgrade or regular operations. 1. Identify the Conflicting Application

Look for a DWORD value named XmlServicePort or RestApiPort (depending on your specific Veeam version architecture).

Several applications frequently conflict with Veeam over Port 443. Common examples include:

Before you can fix the conflict, you must find the Process Identifier (PID) of the program currently occupying the port. Method A: Using Command Prompt (Fastest) This error typically occurs during an upgrade to

Change the port from 443 to 444 or another free port, or remove the binding. Scenario B: Hyper-V Replication Server

Still, if necessary:

It was a typical Monday morning for John, the IT administrator at a medium-sized company. He was sipping his coffee and checking his emails when he received a notification from his monitoring system about a critical issue with one of his Veeam Backup & Replication servers. The error message read: