Required Port 443 For Veeam Backup & Replication Is Occupied By Another Application Jun 2026

Sometimes, the port is reserved by the system’s HTTP driver ( http.sys ).

Run the following command to see what is listening on port 443: netstat -ano | findstr :443 Use code with caution. Copied to clipboard Locate the Application: Note the PID in the far-right column (e.g., ). Use this command to see the application name: tasklist /FI "PID eq [YOUR_PID]" Use code with caution. Copied to clipboard Alternative: Task Manager , go to the tab, and sort by PID. 2. Common Culprits Several services frequently "park" on port 443: Hyper-V Replication: If your VBR server also acts as a Hyper-V Replica server, it may be using 443. IIS (Internet Information Services):

If you must run both applications on the same server, change the port used by the non-Veeam application.

In a Windows Server environment, Port 443 is frequently claimed by standard web server roles or third-party management tools. The most common offenders include: Sometimes, the port is reserved by the system’s

Negative. Corporate policy M-2024-09. All Windows servers with financial data classification must have AcmeCorp agent bound to default HTTPS port for SSL inspection. No exceptions. Change request would take 3 weeks.

Often installed on Windows Servers, hosting default websites on HTTPS.

The output was chilling:

Older desktop versions famously utilized port 443 as a fallback for incoming connections.

Or in PowerShell:

) to finish the Veeam installation, then re-evaluate the service's port requirements afterward. Do you need help checking if Hyper-V Replication is specifically causing the hold-up on your server? Use this command to see the application name:

Note for Users experiencing this on VBR v13: Some users report that simply allowing port 443 during the update, and having it occupied immediately afterward, can cause issues with the Veeam Web Service/API Gateway , so it is highly recommended to permanently reconfigure the conflicting application, not just stop it temporarily. Summary Checklist Command/Tool netstat -anob Stop IIS iisreset /stop Check Hyper-V Hyper-V Manager -> Replication Install Veeam Run setup as Administrator

Once the conflicting application has been identified, choose the most appropriate resolution path based on your environment and version of Veeam.

Before making changes, you must find out exactly which application or process has hijacked port 443. Method A: Using Windows Command Prompt (Fastest) Common Culprits Several services frequently "park" on port

Veeam Backup & Replication is a popular data backup and recovery solution used by many organizations to protect their critical data. However, during the installation or configuration process, users may encounter an error message indicating that the required port 443 for Veeam Backup & Replication is occupied by another application. In this article, we will explore the causes of this issue, its impact on Veeam Backup & Replication, and provide step-by-step instructions on how to resolve the problem.