Encountering the error is a critical roadblock, particularly when upgrading to Veeam v13 . Starting with this version, Veeam requires port 443 for its REST API and Web UI. If another service is already using this port, Veeam's services will fail to bind and start, halting your backup environment. Identifying the Conflicting Application
Several standard server roles and applications often conflict with Veeam’s requirements: Encountering the error is a critical roadblock, particularly
If the server is configured as a Hyper-V Replica server, it may use port 443 by default. Encountering the error is a critical roadblock, particularly
As of the latest releases, there is no supported method to change the port for the Veeam Web Service/API Gateway itself. Encountering the error is a critical roadblock, particularly
Routing and Remote Access services often bind to 443 for VPN connections.