Required Port 443 For Veeam Backup & Replication Is Occupied By Another Application ~upd~ -

Veeam operates on a "component-based" architecture. The Veeam Backup Server is the brain, and it communicates with "Components" (Proxies, Repositories, WAN Accelerators) using a proprietary protocol wrapped in SSL/TLS encryption.

Veeam experts recommend moving the backup server to a dedicated, non-domain-joined environment to avoid conflicts and improve security.

Before you can fix the issue, you need to find out which application has hijacked Port 443. Here are the two most effective methods to do this on a Windows Server. Method A: Using Command Prompt (Netstat) Veeam operates on a "component-based" architecture

Look for the listening process (state LISTENING ). Note the (Process ID) in the last column.

will fail to start, potentially blocking your upgrade or regular operations. 1. Identify the Conflicting Application Before you can fix the issue, you need

If you must keep the conflicting application running on the same server, change its settings to use a different port (such as 444 or 8443).

Depending on what is using the port, you have three main options: stop the service temporarily, change the port of the other application, or reconfigure Hyper-V. Scenario A: Microsoft IIS is Occupying 443 Note the (Process ID) in the last column

Ensure Veeam Backup Service and Veeam Web Service are running.

If after following all steps the port remains occupied by an unidentified or protected service, you may need to:

: Run the following command: netstat -ano | findstr :443