Required Port 443 For Veeam Backup Replication Is Occupied By Another Application Link [best] <Must Read>

: The right-most column of the output is the Process ID (PID) .

The error "Required port 443 for Veeam Backup & Replication is occupied by another application" typically occurs during an upgrade to , as this version introduces a hardcoded requirement for port 443 for its REST API and Web UI. Review of Issue & Solutions

Veeam Backup & Replication is a comprehensive data protection solution designed to ensure business continuity by providing backup, replication, and restore capabilities for virtual, physical, and cloud-based environments. For its operations, especially in environments where SSL/TLS encryption is required, Veeam Backup & Replication relies on specific network ports. Port 443, the standard port for HTTPS, is one such critical port.

If the output shows an application name like System , IIS , sqlservr.exe , skype.exe , or vmware-hostd.exe , you have identified your conflict. : The right-most column of the output is

If you are seeing errors indicating that , this guide will help you identify the culprit and clear the path for your backups. Why Veeam Needs Port 443 Veeam uses Port 443 for several critical functions:

: Veeam usually creates its own firewall rules, but you must ensure no external network firewalls are blocking 443 communication between the backup server and its components PowerShell commands to identify exactly which process is holding that port?

If the culprit is RRAS (), you can disable it via the Server Manager. For its operations, especially in environments where SSL/TLS

If you want to keep it closer to your original structure:

: If port 443 is occupied, the Veeam installer will typically block upgrades from v12 to v13 until the conflict is resolved.

Sometimes the installer thinks port 443 is occupied due to a stale socket or Windows HTTP API reservation. Check with: If you are seeing errors indicating that ,

Securely transmitting data to service providers.

Reconfigure the external incoming rules on your perimeter firewall or gateway router.

Change the value from 443 to a different port (e.g., 444).