Required Port 443 For Veeam Backup & Replication Is Occupied By Another Application [hot] Official

Are you running other (like IIS or Apache) on this backup machine?

Once you know the offending application, choose one of the following strategies to resolve the conflict. Strategy 1: Stopping or Disabling the Conflicting Service

To make your backup environment work perfectly, let me know: What is currently using port 443?

Open services.msc and stop the offending service (e.g., World Wide Web Publishing Service for IIS).

TCP 172.18.0.10:443 0.0.0.0:0 LISTENING 7892 (Veeam) TCP 0.0.0.0:443 0.0.0.0:0 LISTENING 4428 (AcmeCorp) Are you running other (like IIS or Apache)

Locate the field for or HTTPS Port (defaulted to 443).

If the site on IIS is non-critical, shift its HTTPS binding to an alternative port (e.g., port 8443) via the IIS Manager console. If IIS is not required on your Veeam Backup server, open services.msc and stop/disable the World Wide Web Publishing Service . Culprit B: Microsoft Hyper-V Replication Services

To his relief, the backups started working again, and the CEO was happy to hear that the critical server had been backed up successfully. However, John knew that he needed to find a more permanent solution to avoid similar conflicts in the future.

Get-Process -Id 1234

Port 443 is the standard TCP port used for HTTPS (secure web traffic). Veeam requires this port for various components—most notably the and the Veeam Backup Service on the backup repository—to enable secure communication between the console, the server, and managed agents.

Once the installer passes the compatibility check, the Veeam installation will proceed. After the installation is successful:

Port 443 is the universal standard for secure HTTPS traffic. It is highly common for a backup server to share roles or host other applications that claim it. The most frequent culprits include:

John breathed a sigh of relief, happy that he had resolved the issue before it caused any major problems. He made a mental note to double-check the configuration of new applications before they were deployed, to avoid similar conflicts in the future. Open services

Required port 443 (HTTPS) for Veeam Backup & Replication is occupied by another application. Please free the port and restart the Veeam Backup Service.

Raj’s reply came in 14 seconds. That was never a good sign.

: Look for the PID (Process ID) in the right-most column of the result (e.g., 1234 ).