Required Port 443 For Veeam Backup & Replication Is Occupied By Another Application ((top)) «PREMIUM ✓»

Used for integration with automation tools, Backup Enterprise Manager, and the VBR Console. Veeam Web Service: Handles secure web-based traffic.

Once you know what application is using the port, choose one of the three strategies below to resolve the issue. Strategy 1: Stop or Disable the Conflicting Service

First, we need to find out what is currently using port 443. To do this, follow these steps: Strategy 1: Stop or Disable the Conflicting Service

Starting with recent versions (v13+), this port is hardcoded for the API Gateway, meaning the installer checks for its availability and fails if another service is listening on it. 1. Identify the Conflicting Application

Is Veeam installed on a or shared with other roles (like vCenter or IIS)? Identify the Conflicting Application Is Veeam installed on

Open services.msc and stop the offending service (e.g., World Wide Web Publishing Service for IIS).

I'll cite the Veeam Community post for the hardcoded port information, the port usage documentation, and the netstat commands. Now I'll write the article. you see the error that , it's a clear sign that your Veeam server can't start a critical service, often the web UI or API gateway. This is a common hurdle, especially during a new installation or an upgrade to a newer version, because port 443 is the default for secure web traffic. the port usage documentation

Look for lines showing LISTENING in the State column. The number at the very end of that line is the . Note this number down. Method B: Using PowerShell

Older server-side instances or specific communication agents. Step 2: Free Up Port 443

On the page, locate the Veeam Backup Management Port field.

Secure connections to Veeam Cloud Connect service providers.