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

Culprit A: IIS (Internet Information Services) or World Wide Web Publishing Service

She had been planning this migration for six months. The old tape libraries were being retired. The new all-flash object storage array, affectionately nicknamed "The Vault," was racked and stacked. Veeam Backup & Replication v12.1 was the orchestrator, the brain that would move 4.2 petabytes of financial transaction data from the production cluster to immutable cloud storage. And its control heart—the web UI, the REST API, the service endpoint—needed port 443.

In your elevated command shell, terminate the blocking process using the command: taskkill /F /PID Use code with caution.

Once you have the process name, you can determine the best course of action. Here are the most common offenders: Culprit A: IIS (Internet Information Services) or World

Connections to Veeam Cloud Connect and public cloud object storage (AWS, Azure, Google Cloud).

netstat -ano | findstr :443

Look for lines showing LISTENING in the state column. The number at the very end of that line is the . Veeam Backup & Replication v12

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

: Run the following command to find the Process ID (PID) using the port: Get-NetTCPConnection -LocalPort 443 | Select-Object LocalAddress, LocalPort, OwningProcess, State .

Required port 443 (HTTPS) for Veeam Backup & Replication is occupied by another application. Please free the port and restart the Veeam Backup Service. Once you have the process name, you can

If port 443 is occupied, you must identify and reconfigure the competing application, as Veeam's use of 443 is currently non-negotiable for v13. 1. Identify the Conflicting Application

Troubleshooting "Required port 443 for Veeam Backup & Replication is occupied by another application"

To make your backup environment work perfectly, let me know: What is currently using port 443?

If you must run IIS on the same server as Veeam, change the IIS HTTPS port: Open the .

In multi-component installations: If Veeam Backup Enterprise Manager is already installed on the same server, it may have bound port 443 before the main Backup & Replication service.