If the application occupying the port isn't vital to that specific server, the easiest fix is to stop it.
: The installer performs a pre-install check; if 443 is in use, the "Required port 443 is occupied by another application" error triggers Common Conflicting Applications Hyper-V Replication : Often uses 443 for HTTPS replication traffic IIS (Internet Information Services) If the application occupying the port isn't vital
IIS or Apache instances running on the same machine. Solutions and Workarounds if 443 is in use
Some users report disabling the conflicting service only during the Veeam upgrade, though the VBR console may still fail to work post-upgrade if 443 remains occupied. If the application occupying the port isn't vital