Major Issues After Upgrading to Veeam V13: Port 443 Conflict 11 Dec 2025 —
He connected a crash cart—a keyboard and monitor directly into the server.
Alternatively, during installation, temporarily stop IIS with:
Warning: Changing Veeam's default ports may require you to update firewall rules and re-authenticate connected components. Option C: Use a Dedicated Backup Server Major Issues After Upgrading to Veeam V13: Port
Veeam Backup & Replication is a popular data backup and disaster recovery solution used by many organizations to protect their critical data. One of the key requirements for Veeam Backup & Replication to function properly is that it needs to communicate over specific ports, with port 443 being one of them. However, what happens when the required port 443 for Veeam Backup replication is occupied by another application? In this article, we will explore the issues that arise when port 443 is occupied, and provide a step-by-step guide on how to resolve this common problem.
Windows Server often enables IIS by default, which claims ports 80 and 443.
(Event Viewer → Applications and Services Logs → Veeam Backup). One of the key requirements for Veeam Backup
Move the Veeam installation out of shared spaces into its own isolated operating system. General production infrastructure.
When the local web engine initializes, it requests exclusive binding to 0.0.0.0:443 . If any other software is already listening on that interface, the system returns a binding collision error. Step 1: Identify the Conflicting Application
If you installed vCenter components directly on the same Windows machine as Veeam, VMware's reverse proxy will claim Port 443. Windows Server often enables IIS by default, which
Run the following command to find the application associated with that PID:
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The last number (in this example, ) is the Process ID (PID) [15†L22-L24].
Edit the application configuration file (e.g., httpd.conf for Apache or nginx.conf for Nginx) and change the listening port from 443 to another custom port. Restart the application service. 4. Anti-Virus and Security Agents