The full error typically reads: "Required port 443 for Veeam Backup & Replication is occupied by another application. Please specify another port or stop the application that uses this port and try again." While the error message seems straightforward—"another app is using the port"—the resolution is rarely a simple matter of killing a process. Port 443 is the default port for HTTPS (HTTP Secure) traffic, and in a Windows Server environment, multiple roles, services, and third-party applications compete for it.
tasklist | findstr 4488
Remember, port 443 is prime real estate. Decide which application—Veeam or the existing service—is more critical for your environment, then adjust accordingly. With the steps above, you’ll have Veeam Backup & Replication listening securely and ready to protect your data. 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. The full error typically reads: "Required port 443
netsh http delete urlacl url=http://+:443/ netsh http delete urlacl url=https://+:443/ After deletion, restart the Veeam services or the installer. If w3wp.exe or inetinfo.exe is the offender, IIS is running. You have three choices:
netsh http show urlacl | findstr :443 This will list all URL reservations. Look for something like: http://+:443/ or https://+:443/ reserved for a specific user or service group (e.g., NT SERVICE\SSRS ). tasklist | findstr 4488 Remember, port 443 is
Introduction In the complex ecosystem of data center management, Veeam Backup & Replication has established itself as a gold standard for virtualization and cloud data protection. However, even the most robust platforms can encounter frustrating roadblocks. One of the most common and cryptic errors that administrators face during installation or upgrade occurs when Veeam attempts to bind to Port 443 .
| Application / Service | Typical Use Case | | :--- | :--- | | | Default Web Site, WSUS, or any internal web app. | | Microsoft SQL Server Reporting Services (SSRS) | Uses HTTP.SYS to listen on Port 443 for reports. | | Skype for Business / Teams | Can bind to ports unexpectedly. | | Remote Desktop Gateway (RD Gateway) | Uses HTTPS (443) for secure RDP connections. | | Syslog / SIEM agents | Some agents redirect SSL traffic via 443. | | Antivirus Web Filtering | Symantec, McAfee, or Cisco AMP can proxy HTTPS. | | Hyper-V Host Service | Certain Hyper-V configurations use port 443 for management. | | Docker Desktop (Windows containers) | The MobyLinuxVM engine may bind to 443. | | Previous Veeam Installation | Leftover services from a failed uninstall. | Step-by-Step Diagnosis and Resolution Step 1: Identify the Process Using Port 443 Do not guess. Use built-in Windows tools to get the definitive Process ID (PID). Need further assistance
Run this command in an elevated CMD or PowerShell: