Required | Port 443 For Veeam Backup & Replication Is Occupied By Another Application
Open IIS Manager, select the Default Web Site, click Bindings in the right-hand panel, edit the HTTPS binding, and change the port from 443 to another number.
Benefits
To prevent port conflicts and ensure maximum backup performance, keep these architecture rules in mind:
For any existing VMs replicating to this host, update their individual replica server port properties to match. Culprit C: VMware Workstation or Third-Party Web Servers Open IIS Manager, select the Default Web Site,
Veeam uses Port 443 for secure communication. Changing Veeam's port requires reconfiguring all managed servers and components to trust the new port, which is complex. It is usually easier to move the other application off port 443.
User experience flow (concise)
If Microsoft IIS is running on the backup server, it may be holding a broad binding across all IP addresses on port 443. Open the . Open the
John's heart sank. This was not good. Veeam Backup & Replication was his primary backup solution, and if it wasn't working, his company's data was at risk. He quickly opened the Veeam console to investigate the issue.
After a few minutes of digging, John discovered that the problem was indeed related to port 443, which was the default port used by Veeam Backup & Replication for communication between the backup server and the Veeam console. However, it seemed that another application had taken over the port, causing the conflict.
If you absolutely cannot free up port 443 on the host operating system, you can instruct Veeam to install or run on a different port during or after installation. During Installation and if it wasn't working
Execute the following command to look for active connections on port 443: netstat -ano | findstr :443 Use code with caution.
The error occurs because Veeam Backup & Replication (VBR) mandates exclusive use of TCP Port 443 for its REST API Gateway and Web UI components . Starting with VBR v13, this port requirement is hardcoded during both fresh installations and in-place upgrades. If another web server, replication service, or security tool is already listening on HTTPS port 443, the Veeam installer will halt or the VeeamBackupRESTSvc service will fail to bind and refuse to start.