Required Port 443 For Veeam Backup Replication Is Occupied By Another Application Link Verified — Fully Tested

To avoid port conflicts in production environments, implement these architectural rules:

If you must keep the conflicting application on the same server, reconfigure it to use an alternative port (like Port 8443 or 4443).

netsh http delete urlacl url=https://+:443/

Port 443 is the standard port for secure HTTPS traffic. Veeam Backup & Replication V12 and older versions historically used port 443 for external connections, but changes in V13 introduced a critical new dependency: The last number in the list is the (Process ID)

If you are upgrading from Veeam v12 to v13 and have no alternative, you can temporarily disable the conflicting service to allow the upgrade to complete:

This will output a list of active connections. The last number in the list is the (Process ID). To find the name of the application, run: tasklist /fi "pid eq [PID_FROM_ABOVE]" Use code with caution. 4. How to Resolve the "Port 443 Occupied" Error

Secures the transport layer for service provider connections. How to Resolve the "Port 443 Occupied" Error

If the Windows Server hosting Veeam also runs IIS, the Default Web Site often binds to port 443.

In VBR v13, port 443 is for the API Gateway and Web service; there is currently no supported way to change this within the Veeam configuration itself. Therefore, you must move the other application to a different port. For Hyper-V Replication Servers : Navigate to Hyper-V Settings > Replication Configuration .

After freeing up Port 443, restart your Veeam infrastructure services to allow Veeam to successfully bind to the port. Open ( services.msc ). Scroll down to the Veeam entries. The last number in the list is the (Process ID)

Use Windows registry modifications to reserve specific port ranges for backup infrastructure.

If your backup server runs a web application or the WSUS management console via IIS, the default web binding will hold port 443.