Required Port 443 For Veeam Backup & Replication Is Occupied By Another Application ((link)) < Authentic 2026 >

Restart all Veeam services via services.msc for the changes to take effect. Step 4: Verify the Resolution

The default web server on Windows Server often hosts an HTTPS site binding to 443.

Once port 443 is free, restart Veeam so it can claim the port. Open ( services.msc ). Scroll down to the Veeam services. Right-click Veeam Backup Service and click Restart .

Port 443 is the default port for HTTPS web traffic. Veeam uses this port for several vital functions: communication between the backup server and vCenter Server/ESXi hosts, communication with cloud repositories, and for the Veeam Guest Catalog service. In version 13, Veeam introduced the "Veeam Web Service" and API Gateway, which during installation and for normal operation. This service handles REST API requests and modern web-based management interfaces. The installer blocks the upgrade process when it detects another service already listening on this port. The error essentially means Veeam is unable to bind to the port it needs to operate, which halts the installation or upgrade process. Restart all Veeam services via services

(Be careful – this removes all HTTPS:443 reservations for non-admins.)

Port 443 is the standard port for secure web traffic (HTTPS). In a Veeam environment, it is used for several critical functions:

If you have both and Veeam Enterprise Manager on the same machine (not typical for performance reasons): Open ( services

netsh http show servicestate

Open IIS Manager, expand your site, click Bindings in the right-hand Actions panel, select the HTTPS binding, edit it, and change port 443 to something else (e.g., 8443 ).

Complete the wizard to apply changes. Ensure your network firewalls allow traffic on this new port. Step 4: Verify the Resolution Port 443 is the default port for HTTPS web traffic

For production environments, the best practice remains to give Veeam its own dedicated server. In the long run, investing in a separate machine or virtual machine dedicated solely to Veeam Backup & Replication is the most reliable way to prevent port conflicts, ensure high performance, and maintain your environment's security posture.

TCP 0.0.0.0:443 0.0.0.0:0 LISTENING 1234

You can change the port during the Veeam installation process. When the installer asks for ports, type a different number for the secure web connection. If Veeam is already installed, you may need to modify the registry or run a repair installation to safely change its default communication ports. Step 4: Restart Veeam Services

Secure API calls to public cloud platforms.

If you cannot free up port 443 on the host operating system because the conflicting application is critical, you can configure Veeam to use an alternative port during or after installation. During Clean Installation Run the Veeam Backup & Replication installer.