Required Port 443 For Veeam Backup Replication Is Occupied By Another Application Link ^hot^ Jun 2026

System administrators upgrading or installing face an blocker where the installation wizard or the core services fail to start. The blocking error indicates that TCP Port 443 is already in use by another software process on the backup server.

Major Issues After Upgrading to Veeam V13: Port 443 Conflict

Change the default port from 443 to an available port (e.g., 4443 or 8443). Complete the wizard and restart the Veeam services. Step 3: Verify the Fix

If you are installing or upgrading Veeam Backup & Replication (VBR), encountering the error is a common, albeit frustrating, roadblock. Complete the wizard and restart the Veeam services

Port 443 is the standard port for HTTPS (Hypertext Transfer Protocol Secure) traffic. When Veeam Backup & Replication requires this port for its web services or API Gateway, it checks for availability during installation or service startup. If another application is already bound to this port, Veeam cannot claim it, triggering the port conflict error.

Standard vCenter components frequently listen on this port.

: If your backup server also acts as a Hyper-V replica server, it often reserves port 443. IIS (Internet Information Services) When Veeam Backup & Replication requires this port

The most secure, stable, and future-proof solution is to ensure port 443 is exclusively available for Veeam Backup & Replication. This means:

and cannot be changed within Veeam v13 itself, you must reconfigure the conflicting application instead. Veeam Community Resource Hub Identify the Occupying Process Open PowerShell as an Administrator. netstat -anob | findstr :443 to find the Process ID (PID) using the port. Match the PID in Task Manager to find the specific software. Reconfigure Hyper-V (If applicable) Hyper-V Settings Replication Configuration Change the specified port from to an alternative (e.g., 444).

Do not guess. Use built-in Windows tools to get the definitive Process ID (PID). Veeam cannot claim it

Veeam allows you to (with caveats).

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

The most reliable solution is to follow Veeam's recommendation: "we do not expect the backup server to be shared with 3rd party apps as that commonly leads to unpredictable behavior". Ideally, dedicate a server exclusively to Veeam Backup & Replication.