Veeam Backup & Replication (VBR) v13 introduces a strict requirement for , which is used for the new hardcoded REST API and Web UI services . This shift from previous versions can cause critical installation or upgrade failures if another application—such as IIS, VMware Workstation, or Hyper-V Replication—is already listening on that port. Identifying the Conflicting Application
Change the specified HTTPS port from 443 to an alternative open port (such as 4443 ).
If you are upgrading from Veeam v12 to v13 and have no alternative, you can temporarily disable the conflicting service to allow the upgrade to complete:
Need further assistance? Visit the official Veeam R&D Forums or open a support case with Veeam Customer Support. Include the output of veeamportssniffer.exe (available in the Veeam ISO tools folder) for rapid troubleshooting. Veeam Backup & Replication (VBR) v13 introduces a
Once you've identified the conflicting application, evaluate your options:
netsh http delete urlacl url=https://+:443/
: Use this command to find the specific process name: Get-Process -Id (Get-NetTCPConnection -LocalPort 443).OwningProcess Common Applications Causing Conflicts If you are upgrading from Veeam v12 to
: Let the installation finish completely. This populates the core databases and links the new identity management engines. Phase 4: Long-Term Coexistence Strategies
If you recently uninstalled Veeam or had a failed upgrade, some services may linger.
The Veeam development team has stated that sharing the backup server with third-party applications is because it leads to unpredictable behavior and security risks—the backup server contains keys to the entire production environment [13†L30-L35]. Once you've identified the conflicting application
Several common enterprise applications frequently conflict with Veeam over port 443. 1. Windows Internet Information Services (IIS)
What did the netstat command show as occupying the port? Is this a physical server or a virtual machine (VM) ? Share public link
Remote managed service providers or isolated cloud connect nodes. Moving Forward
