Required Port 443 For Veeam Backup Replication Is Occupied By Another Application Link [verified] Jun 2026

Sometimes the installer thinks port 443 is occupied due to a stale socket or Windows HTTP API reservation. Check with:

Locate the section and change the HTTPS port from 443 to an unassigned port (e.g., 4443 ).

Many organizations discovered this change only during their upgrade attempts. Managed Service Providers (MSPs) reported having to halt V13 rollouts because of widespread port conflicts. In one notable case, a professional noted he had to "stop rolling out the updates to V13 because it is causing almost nothing but problems" after encountering port 443 occupied by important applications at customer sites.

: Run the netstat -ano | findstr :443 command again to confirm that no applications are listening on the port. Sometimes the installer thinks port 443 is occupied

Sometimes, netstat shows that the "System" process is listening on 443, but IIS is not installed. This is often caused by listening on port 443 for HTTPS listeners.

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Scenario B: The Conflict is Caused by IIS (or Other Web Services) Managed Service Providers (MSPs) reported having to halt

Expand your server, expand , and right-click the specific site (such as Veeam Backup Web UI) and select Bindings . Select the https binding and click Edit . Change the port to a different available port (e.g., 8443 ). Restart IIS to apply the changes. Scenario C: Changing Veeam's Required Ports

Is this shared with vCenter or an IIS web server?

If reconfiguration isn't feasible, you can temporarily stop the conflicting service during Veeam installation or upgrade. One user successfully tested this approach: "I was able to temporarily disable the service using 443 and successfully complete the upgrade to v13". Sometimes, netstat shows that the "System" process is

For now, while Veeam product leadership has indicated a future intention to make the port configurable in VBR depending on demand, the present reality is that port 443 is a hard requirement for the newest versions. This guide provides you with the strategies you need to navigate that requirement and restore a stable, conflict-free data protection environment.

: Open Task Manager, go to the Details tab, and match the PID to find the application name.

Port 443 is the standard for HTTPS, making it a high-traffic area. Frequent "squatters" include: Hyper-V Replication: By default, Hyper-V uses 443 for its replication traffic. IIS (Internet Information Services):

Apache, Nginx, or management interfaces for third-party software. How to Identify and Evict the Occupant To reclaim the port for Veeam, follow these steps:

I can provide step-by-step instructions to reconfigure that specific software. Share public link