Required Port 443 For Veeam Backup Replication Is Occupied By Another Application Link May 2026

Resolving Port 443 Conflicts in Veeam Backup & Replication Veeam Backup & Replication is the backbone of many disaster recovery strategies, but its installation or operation can come to a screeching halt when a "Port 443 occupied" error appears. Because Port 443 is the industry standard for HTTPS traffic, it is highly contested by web servers, monitoring tools, and communication platforms.

Symptoms of Port 443 Occupation

The result made his blood run cold: vmware-hostd.exe. Resolving Port 443 Conflicts in Veeam Backup &

IIS (Internet Information Services): Web servers hosted on the same machine often default to 443 for HTTPS. Identify IIS binding: netstat -ano | findstr :443

This error occurs when another service is using TCP port 443 Veeam Backup & Replication (VBR) v13 and newer requires for its Web Service/API Gateway Open IIS Manager → remove or change the

Conclusion

Example short remediation (IIS conflict)

1. Identify IIS binding:

   netstat -ano | findstr :443
   tasklist /fi "PID eq 1234"
   

2. Open IIS Manager → remove or change the HTTPS binding for the site using 443.
3. Restart W3SVC:

   Restart-Service W3SVC
   

4. Verify Veeam can bind to 443 and start services.