Required Port 443 For Veeam Backup & Replication Is Occupied By Another Application (2025)

Open services.msc , locate the offending service (like World Wide Web Publishing Service or VMware Host Agent ), right-click it, and select Stop . Change its Startup Type to Manual or Disabled if it is no longer required on this machine. Strategy 2: Reconfigure the Conflicting Application

Before you can fix the port conflict, you need to identify exactly which process is using it. Follow these diagnostic steps:

Scenario 1 — IIS default website bound to 443 blocking Veeam

John's heart sank. This was not good. Veeam Backup & Replication was his primary backup solution, and if it wasn't working, his company's data was at risk. He quickly opened the Veeam console to investigate the issue.

Proceed through the wizard until you reach the step. Open services

She typed a final note into the change management ticket:

Before you can resolve the conflict, you must find which process is currently listening on port 443. Execute the netstat command : netstat -ano | findstr :443

Execute the following command to look for active connections on port 443: netstat -ano | findstr :443 Use code with caution.

: Alternatively, run netstat -anob | findstr :443 to see the executable name directly. Common culprits include: Follow these diagnostic steps: Scenario 1 — IIS

Raj’s policy brain clicked. "A network-level segmentation exception. That… could work. The agent would still monitor the management NIC. The backup NIC is just a data plane."

Once the conflicting application has been identified, choose the most appropriate resolution path based on your environment and version of Veeam.

If your Veeam Backup server doubles as a Hyper-V host, the native Hyper-V Replication engine might be configured to use HTTPS traffic over port 443. Open the Hyper-V Manager . Click Hyper-V Settings > Replication Configuration .

If you cannot alter the conflicting application, you can instruct Veeam to use an alternative port during or after installation. During a Fresh Installation: He quickly opened the Veeam console to investigate the issue

Minimal implementation roadmap (phased)

Required Port 443 for Veeam Backup & Replication is Occupied by Another Application

Given how many applications (like IIS, Skype, TeamViewer, or even Windows core components) also use this port, a conflict is a common obstacle during installation or daily operation. Below is a comprehensive breakdown of why this issue occurs, how to resolve it, and the best practices to prevent it from reappearing.

When upgrading to Veeam Backup & Replication (VBR) v13 , many users encounter a critical installation block: