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

Since Veeam's port 443 requirement is mandatory for v13, the solution involves reconfiguring the application: Reconfigure Hyper-V Replication Navigate to Hyper-V Settings Replication Configuration Change the listening port from to an alternative (e.g., 444).

If you must keep the conflicting software running on the same server, change its port so Veeam can have 443.

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

user wants a long article about troubleshooting the error "required port 443 for veeam backup & replication is occupied by another application". I need to search for comprehensive information on this topic. I will follow the search plan outlined in the hint. search results provide a good starting point. I need to gather more specific information on troubleshooting steps and common causes. I'll open several relevant results to gather detailed information. search results provide a wealth of information. I will structure the article with an introduction, sections on why port 443 is critical, common causes, step-by-step diagnostics, resolution strategies, Veeam 13 updates, best practices for prevention, and a conclusion. I'll cite the relevant sources. Now I'll write the article. conflicts are among the most common and disruptive issues when setting up or upgrading Veeam Backup & Replication, and few cause more immediate frustration than seeing the error that port 443 is already occupied. For many administrators, the issue is frequently discovered during a critical upgrade window, often when attempting to move to version 13, where port 443 has become a mandatory requirement. This guide will walk you through exactly why this error occurs, how to diagnose the conflicting application, and the precise steps you need to follow to resolve the conflict and get Veeam functioning properly. Since Veeam's port 443 requirement is mandatory for

In many cases, port 443 is hardcoded in the installer, meaning you cannot simply choose a different port during the setup process. Step 1: Identify the Conflicting Application

: Default web sites or other web applications hosted on the same server. Step 2: Resolve the Conflict

If the application occupying the port is not needed on your Veeam Backup server, the cleanest solution is to remove it. I need to search for comprehensive information on this topic

To find out what that PID is, run: tasklist | findstr [PID_Number] Method B: Using Resource Monitor If you prefer a graphical interface: Press Win + R , type resmon , and hit Enter. Navigate to the tab. Expand the Listening Ports section. Click on the Port column to sort numerically.

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

Opened IIS Manager → Default Web Site → Bindings → removed HTTPS:443 binding → Restarted IIS ( iisreset ). Result: Veeam Backup Service started normally. go to the Details tab

Or in PowerShell:

: Open Task Manager, go to the Details tab, and find the application matching that PID. 2. Common Conflicts and Solutions