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

Option D — Use SNI/multiple certificates with HTTP.sys (advanced)

The number 1234 is the Process ID (PID). Option D — Use SNI/multiple certificates with HTTP

| Measure | Description | |---------|-------------| | | Avoid installing Veeam on servers already running IIS, Exchange, or other HTTPS services. | | Port auditing | Regularly run netstat -ano to monitor port usage. | | Installation order | Install Veeam first, then other web services (or reconfigure their ports immediately). | | Documentation | Maintain a "Port Usage Register" for critical infrastructure servers. | | | Installation order | Install Veeam first,

: In environments where a web server (like IIS, Apache, or Nginx) is running on the same machine as the Veeam Backup & Replication server, it commonly uses port 443 for secure web traffic, leading to a conflict. : The installer performs a pre-install check; if

: The installer performs a pre-install check; if 443 is in use, the "Required port 443 is occupied by another application" error triggers Common Conflicting Applications Hyper-V Replication : Often uses 443 for HTTPS replication traffic IIS (Internet Information Services)

.