If is using the port, you can change its binding via the IIS Manager (InetMgr.exe) by selecting "Edit Bindings" for the website and changing 443 to a different port.
When upgrading to or installing , many administrators encounter the error: "Required port 443 for Veeam Backup & Replication is occupied by another application" . This occurs because port 443 is now hardcoded for the mandatory Veeam REST API Service and Web UI in version 13 . Why Port 443 is Required
If is the cause, go to Hyper-V Settings > Replication Configuration and change the port from 443 to another value (e.g., 444). If is using the port, you can change
: Use the command Get-NetTCPConnection -LocalPort 443 to find the associated PID.
Currently, there is within the Veeam installer to change the port for the REST API Gateway. You must free up the port on the host server: Stop or Reconfigure the Conflicting Service : Why Port 443 is Required If is the
In Veeam v13, port 443 is used for the . If another service is already listening on this port, the Veeam services will fail to bind, preventing the VBR console from starting or the upgrade from completing. How to Identify the Conflicting Application
: If the conflicting application is only needed occasionally, stop the service, complete the Veeam v13 upgrade, and then attempt to restart the other service. Note that Veeam v13 services will still fail to start if the port is occupied later. You must free up the port on the
: Open a command prompt as administrator and run netstat -anob | findstr :443 . This will display the Process ID (PID) and the name of the executable using the port.
: Frequently conflicting services include IIS (Internet Information Services) , Hyper-V Replication , Remote Desktop Web Access , or third-party security agents like Qualys . Solutions and Workarounds
To resolve the conflict, you must first identify which process is currently using port 443.