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

Resolving Port 443 Conflicts in Veeam Backup & Replication In modern data centers, (HTTPS) is a critical gateway for web services, APIs, and secure communications. For Veeam Backup & Replication (VBR) v13 , port 443 is a hardcoded requirement for the REST API and Web UI services. If this port is occupied by another application, the Veeam upgrade will be blocked, or the services will fail to start. Identifying the Conflicting Application

Before changing any settings, you need to find the exact process ID (PID) and the name of the software using port 443.

This will output a list of active connections. The last number in the list is the (Process ID). To find the name of the application, run: tasklist /fi "pid eq [PID_FROM_ABOVE]" Use code with caution. 4. How to Resolve the "Port 443 Occupied" Error

To find out which specific application is currently using port 443 on your Windows server, use one of the following methods: Resolving Port 443 Conflicts in Veeam Backup &

Port 443 is the default for HTTPS—Veeam needs it for communication between the backup server, proxies, repositories, and the WAN accelerator (especially for Cloud Connect or guest interaction proxies). If something else has claimed that port, your installation won’t proceed.

The "port 443 occupied" error is a minor roadblock, not a dead end. With netstat and a few minutes of detective work, you’ll identify the offender and have Veeam Backup & Replication running smoothly.

Solution A: Free the Port Temporarily (Recommended for Upgrade) To find the name of the application, run:

How to find the right ports under Veeam - Starline Computer GmbH

Third-party software packages often bundle these web servers silently.

: Use this command to find the specific process name: Get-Process -Id (Get-NetTCPConnection -LocalPort 443).OwningProcess Common Applications Causing Conflicts " Elias said

If you installed VMware Workstation or other VMware management tools on the same machine, its built-in web server uses port 443.

"Okay," Elias said, logging in. "What are you hiding?"

Or using PowerShell: