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

Since Veeam v13 does not currently support changing the web service port via the installer, you must resolve the conflict at the source. Solution A: Reconfigure the Competing Service

Peaceful coexistence. Two different universes sharing the same integer, separated only by a virtual wire.

Local management consoles or update agents.

If you changed the port to an alternative one (like 8443 ), remember to append the port number when connecting from remote consoles: backup-server.domain.local:8443 . Final Best Practices

: With port 443 clear, proceed with the upgrade or installation wizard. The wizard will complete successfully and bind the Veeam Web Service to port 443. Since Veeam v13 does not currently support changing

Sort by PID to find the process ID found in the previous step. 2. Resolving the Conflict (Scenarios)

: The desktop client often uses ports 80 and 443 as "alternatives for incoming connections." You may find this option enabled unintentionally, even on server systems. To resolve this, you can uncheck the "Use port 80 and 443 as alternatives for incoming connections" option in Skype's Advanced Connection settings.

: If your backup server also acts as a Hyper-V replica host, it likely uses 443 for replication traffic.

Get-Process -Id (Get-NetTCPConnection -LocalPort 443).OwningProcess Local management consoles or update agents

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

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

Error. Same message.

If the conflict is insurmountable and you are using Veeam v13, some administrators have resorted to more drastic measures. The wizard will complete successfully and bind the

This issue arises because introduces a new Veeam Web Service/API Gateway that strictly requires port 443. Unlike previous versions, this requirement is currently hardcoded for the core web service, making it a "blocker" during setup. 1. Identifying the Conflicting Application

: If another site is using 443, change its binding in the IIS Manager to a different port or a specific IP address.

Once you have the PID (for example, 4124 ), you need to find out what software it belongs to. tasklist /fi "pid eq 4124" Use code with caution. Via Task Manager: Press Ctrl + Shift + Esc to open Task Manager. Go to the Details tab. Click the PID column header to sort numerically. Locate your target PID to see the exact executable name. Common Culprits

Often installed on Windows Servers, hosting default websites on HTTPS.

Though rare, attempting to run vCenter Server on the same Windows machine as Veeam will cause a port conflict because vCenter’s web client also uses 443.