Required Port 443 For Veeam Backup Replication Is Occupied By Another Application Link -
Required Port 443 for Veeam Backup Replication is Occupied by Another Application: A Comprehensive Guide
"Hey Elias," Kevin had said, looking slightly nervous. "I needed to spin up a quick test lab to simulate that patch for the accounting software. I didn't want to bother the production cluster, so I just threw it on the repo server since it has all that RAM. Is that cool?" Required Port 443 for Veeam Backup Replication is
Change the HTTPS port to another value or assign the site a specific IP address to free up 443 on "All Unassigned". For WinRM Conflicts: IIS (World Wide Web Publishing Service) or a
Port 443 is the standard port for HTTPS traffic. Because it is the default secure port for the web, many applications (IIS, Skype for Business, VMware Update Manager, and various web servers) fight for control over it. Veeam requires this port for its internal web server to communicate with the console, mount servers, and manage the backup infrastructure. Hardcoded Requirement : In v13
VMware Workstation/Player: The "VMware Host Agent" often claims 443.
Step 2 — Common culprits
- IIS (World Wide Web Publishing Service) or a website binding using 443.
- Other web servers: Apache, Nginx.
- Reverse proxies or gateways (NGINX, HAProxy).
- VPN or security appliances with local web UI bound to 443.
- Docker containers or Kubernetes services mapped to host port 443.
- Cloud agents or management tools (e.g., System Center components, Splunk, CrowdStrike console).
- Other Veeam components misconfigured to use same port.
Hardcoded Requirement: In v13.0.1.180 and newer, port 443 is mandatory for the Web Service. Currently, there is no supported method to change this port within Veeam or bypass the installer's compatibility check.