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

Several common server applications frequently clash with Veeam over port 443:

Run the following command to see the process name directly:

Resume the Veeam Backup & Replication setup. The port check should now pass. If you still see the error, reboot the server and check again—some processes release ports only after a full restart.

Older versions historically utilized ports 80 and 443 as fallbacks for incoming connections. Older versions historically utilized ports 80 and 443

Method 1: The "Upgrade & Pivot" Strategy (Recommended for Third-Party Apps)

: Open Task Manager , go to the Details tab, and find the process matching that PID to see what application it belongs to. 2. Common Conflicting Applications The most common culprits occupying port 443 are:

If you are using a modern version of Veeam (v13 or later), treat port 443 as a dedicated resource for Veeam to avoid compatibility blocks. For older versions, retaining the flexibility to assign custom ports is often the simplest path to a stable deployment. If you are unable to resolve the conflict on your own, with the details of the conflicting service you identified. REST API access

HKEY_LOCAL_MACHINE\SOFTWARE\Veeam\Veeam Backup and Replication Use code with caution.

Locate the service (e.g., World Wide Web Publishing Service for IIS, or VMware Host Agent ). Right-click the service and select . Change the Startup type to Manual or Disabled . Click Stop , then click OK . Solution 2: Change the HTTPS Binding in IIS

Proceed through the wizard until you reach the step. or configuring Veeam Backup & Replication

If vCenter components or VMware Workstation are installed directly on the backup server, they default to using Port 443 for secure connections.

If your VBR server doubles as a Hyper-V replica host, Hyper-V is likely what blocks the upgrade. You can safely migrate Hyper-V replication to an alternate port:

When installing, updating, or configuring Veeam Backup & Replication, you may encounter a critical error stating that . Port 443 is the global standard for secure HTTPS traffic, and Veeam relies heavily on it for secure infrastructure communications, REST API access, and cloud plugin integrations.

If Veeam is already installed and you need to shift its internal components to a new port, it usually requires updating the underlying database or altering registry string keys.