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

Open VMware Workstation, go to Edit > Preferences > Shared VMs . Click Change Settings , disable sharing, or change the port number to 444. 3. Apache, Nginx, or Tomcat

She reverted the change.

Once you know the process, decide whether to stop it or reconfigure it.

Here’s a detailed, practical blog-style post you can use directly or adapt for your audience. Open VMware Workstation, go to Edit > Preferences

Scenario 2 — HTTP.sys reservation by a management agent (no visible service)

One of the most frustrating errors encountered during the installation or upgrade of Veeam Backup & Replication (VBR)—particularly in newer versions like v13—is:

Before resolving the issue, it is helpful to identify which application is currently holding the port. Common applications that bind to Port 443 on Windows Server include: Apache, Nginx, or Tomcat She reverted the change

She smiled. Tomorrow's problem. For now, port 443 was no longer a battlefield. It was just a number—two numbers, actually, living in parallel harmony, carrying the future of 4.2 petabytes to safety.

No errors. No port conflicts. Throughput: 1.2 GB/s.

After stopping/removing the conflict, run: Scenario 2 — HTTP

Three weeks. The backup window for the monthly archive was in six days . If she missed this window, the storage array would lock for maintenance, and the auditors would flag the gap.

Open an elevated or Command Prompt (Run as Administrator).

: The number at the far right of the output is the Process ID (PID) .

: Using netstat -aon may show the System process (PID 4) using port 443 . This typically indicates a Windows component (like RRAS - Routing and Remote Access Service or ADFS - Active Directory Federation Services) or another kernel-mode driver has claimed the port through the HTTP.sys kernel driver. This can be more complex to resolve, as it is not a traditional user-mode application.