|best| - Required Port 443 For Veeam Backup & Replication Is Occupied By Another Application

This error typically occurs during an upgrade to Veeam Backup & Replication v13 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 

Method C: Using resmon (Resource Monitor)

1. Press Win + R, type resmon, press Enter.
2. Go to the Network tab.
3. Expand Listening Ports.
4. Find port 443, note the PID.
5. Right-click that PID → "Process" to see the service name.

Configuration Orchestration

Windows Admin Center: Frequently uses 443 and may need to be uninstalled or moved to a different port. This error typically occurs during an upgrade to