Is Veeam installed on a or shared with other roles (like vCenter or IIS)?
in an elevated Command Prompt to see which Process ID (PID) and executable are using the port. Common Culprits Hyper-V Replication Is Veeam installed on a or shared with
| | Role of Port 443 | | :--- | :--- | | vCenter & ESXi | The most frequent consumer of port 443 is your virtualization host. vCenter Server and ESXi hosts use TCP port 443 for standard API communication. Veeam uses this to perform backups and restores. | | Update Services | The Veeam server uses outbound connections on TCP 443 to reach the dev.veeam.com update server to check for new product updates and license auto-renewals. | | Veeam Backup & Replication v13 (Web UI) | Since version 13.0.1.180, the Veeam Web Service and API Gateway are hardcoded to port 443. This is a mandatory requirement for the Web UI. | | Console/Client Access | The Veeam Backup & Replication console (and remote management) uses port 443 to communicate securely with the backup server. | | Enterprise Manager/Cloud Tiers | Veeam Backup Enterprise Manager relies on port 443 for central monitoring and management of multiple VBR servers. Cloud tier functionalities also utilize it for secure communication. | vCenter Server and ESXi hosts use TCP port
A common component in RDS deployments.