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

Resume the Veeam Backup & Replication setup. The port check should now pass. If you still see the error, reboot the server and check again—some processes release ports only after a full restart.

This issue arises because introduces a new Veeam Web Service/API Gateway that strictly requires port 443. Unlike previous versions, this requirement is currently hardcoded for the core web service, making it a "blocker" during setup. 1. Identifying the Conflicting Application

You have three choices to fix this problem. Choose the one that works best for your server. Option A: Stop the Other Application If you do not need the conflicting program, turn it off. Right-click the app in Task Manager and select .

Locate the conflicting service (e.g., for IIS). Right-click the service and select Properties . Change the Startup type to Manual or Disabled . Click Stop , then click OK . Strategy 2: Reconfiguring the Conflicting Application Resume the Veeam Backup & Replication setup

┌──────────────────────────────────────────────────────────┐ │ 1. Open Hyper-V Manager -> Replication Configuration │ ├──────────────────────────────────────────────────────────┤ │ 2. Change the HTTPS listener port from 443 to 4443 │ ├──────────────────────────────────────────────────────────┤ │ 3. Update the replication settings on individual VMs │ └──────────────────────────────────────────────────────────┘

Often installed alongside third-party monitoring, ups management, or print tracking tools.

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: This issue arises because introduces a new Veeam

Several common server applications frequently clash with Veeam over port 443:

Task B — Check HTTP.sys and SSL bindings (10 points)

: If the VBR server also acts as a Hyper-V Replica server, it often uses port 443. : Change the Hyper-V Replication port in Hyper-V Settings > Replication Configuration to a different port (e.g., 444). IIS (Internet Information Services) McAfee Web Gateway

Some security solutions (e.g., McAfee Web Gateway, Symantec Endpoint Protection’s web component) or legacy backup agents run a local HTTPS listener for management.

To avoid running into this error again, here are some key strategies to adopt:

Execute this command to get a clean breakdown of the process: powershell