To resolve the issue where the required port 443 for Veeam Backup & Replication is occupied by another application, follow these steps:
Get-Process -Id 4588
"The required port 443 is already occupied by another application." To resolve the issue where the required port
Veeam needs exclusive , uninterrupted access to this port on the backup server itself. If another web server or application is already listening there, Veeam refuses to step on its toes.
Don't panic. Let’s walk through exactly why this happens and how to fix it in under 10 minutes. Let’s walk through exactly why this happens and
As of the latest releases, there is no supported method to change the port for the Veeam Web Service/API Gateway itself.
Let’s put on our detective hat. Open or PowerShell as an Administrator and run this command: Open or PowerShell as an Administrator and run
:
If the result says System or Http.sys , you likely have an HTTP kernel-mode conflict (often IIS or another web server). If it says vmware-hostd —wait, that’s a different problem (your Veeam might be trying to run on an ESXi host, which is wrong).
In , port 443 is hardcoded and required for the Veeam Web Service and API Gateway. This change causes conflicts if another application, such as Hyper-V Replication or WinRM, is already using that port on the same server. Common Conflicting Services