tasklist /fi "PID eq 1234"

: If the upgrade completes but another application subsequently takes port 443, the Veeam Backup & Replication (VBR) services will fail to bind and may not start. How to Identify the Occupying Application

The critical error occurs when the default HTTPS port (443) needed by the Veeam cloud and web services is already bound to another piece of software on the backup server.

Some endpoint detection and response (EDR) or antivirus tools run local web servers for console management that hijack port 443.

This will return a . You can then cross-reference this PID in Task Manager (under the "Details" tab) to find the specific application. Common Conflicting Applications

No—if you temporarily stop the conflicting service, Veeam services will fail again when that service restarts and reoccupies port 443.

Windows:

| Application / Service | Typical Context | |----------------------|------------------| | | Default web server on Windows; may host other websites or management consoles. | | Microsoft Exchange Server | Uses port 443 for Outlook Web Access (OWA) and Exchange Admin Center. | | Skype for Business / Teams (on-prem components) | Uses port 443 for web conferencing and mobility services. | | Apache / Nginx | Third-party web servers running on same Windows VBR server. | | VMware vCenter Server (embedded) | If Veeam is installed on a vCenter Server (not recommended). | | SQL Server Reporting Services (SSRS) | Uses port 443 for report manager. | | Third-party antivirus / proxy services | Some inject a local HTTPS inspection proxy. |

If you encounter the error "Required port 443... is occupied by another application," you must first identify the process holding the port. or PowerShell. Run the following command : netstat -ano | findstr :443 Locate the PID (Process ID) in the rightmost column.

: Open VMware Workstation, go to Edit > Preferences > Shared VMs , click Change Settings , and change the port number or disable sharing. 3. Skype or Teams (Older Versions)

Your action plan must be based on the outcome of your investigation.

Major Issues After Upgrading to Veeam V13: Port 443 Conflict

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How to Fix Veeam Port 443 Conflicts Veeam Backup & Replication relies heavily on port 443 for secure communication. It uses this port to connect to VMware vCenter servers, cloud repositories, and managed infrastructure.

What did the netstat command show as occupying the port? Is this a physical server or a virtual machine (VM) ? Share public link

Option A — Change/Remove the conflicting binding (recommended if feasible)