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

Is this a Veeam server or is it managed by a Service Provider (VSPC)?

The port 443 conflict in Veeam Backup & Replication is more than just a technical annoyance. It reflects a fundamental shift in Veeam’s architecture that prioritizes security and modern web APIs. As Veeam continues to evolve, ensuring the backup server remains a dedicated, single-purpose appliance will become ever more crucial.

Look for the "Specify the port to be used for authentication using Kerberos (TCP/IP)" setting and change it from 443 to a custom port, such as 4443 .

If changing the other applications isn't an option, you can adjust Veeam's configurations or modify its specific port requirements through the Veeam console. You may need to manually configure alternative endpoints or alter network settings in the Veeam Service Provider Console (VSPC) IIS settings to bypass the port 443 hardcoded binding. Verifying and Troubleshooting After Changes Is this a Veeam server or is it

If the conflict prevents Veeam Backup Enterprise Manager from installing or starting, you can change its default communication ports during deployment or via configuration utilities:

Run the following command to find the application associated with that PID:

If your VBR server is co-hosted on a physical box configured as a Hyper-V Replication target, Hyper-V will occupy port 443 for its HTTPS traffic. As Veeam continues to evolve, ensuring the backup

Because port 443 is currently within Veeam v13 settings, you must reconfigure the conflicting application. Option 1: Reconfigure Hyper-V Replication (If Applicable) If Hyper-V is the culprit, change its replication port: Go to Hyper-V Settings > Replication Configuration .

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This article provides a definitive, step-by-step guide to diagnosing why Port 443 is occupied on your Veeam server and how to safely resolve the conflict without breaking existing services. You may need to manually configure alternative endpoints

. If this port is occupied by another application, the VBR services will fail to bind, preventing the software from starting or completing an upgrade. Veeam Community Resource Hub Common Conflict Culprits

: If port 443 is occupied, the Veeam installer will typically block upgrades from v12 to v13 until the conflict is resolved.

This error occurs when another service is using TCP port 443 Veeam Backup & Replication (VBR) v13 and newer requires for its Web Service/API Gateway