Required Port 443 For Veeam Backup Replication Is Occupied By Another Application Link ((hot)) Instant

The situation changed dramatically with Veeam Backup & Replication version 13. Veeam introduced a new service called the "Veeam Web Service" which requires port 443 and, according to Veeam Support, this port is "hardcoded" for the Veeam Web service and API Gateway.

When port 443 is occupied by another application, it creates a significant conflict that can prevent Veeam Backup Replication from functioning correctly. This occupation can occur due to various reasons, such as:

Look for the line that says LISTENING . The number at the far right is the . To see which application owns that PID, run: powershell tasklist /fi "pid eq [YOUR_PID_HERE]" Use code with caution. Common Culprits The situation changed dramatically with Veeam Backup &

The most reliable solution is to follow Veeam's recommendation: "we do not expect the backup server to be shared with 3rd party apps as that commonly leads to unpredictable behavior". Ideally, dedicate a server exclusively to Veeam Backup & Replication.

A: No. The main Veeam Backup Service hardcodes port 443 for internal communication with mount servers, proxies, and repositories. This occupation can occur due to various reasons,

The -a switch displays all connections and listening ports, -o shows the associated process ID, -n displays addresses and port numbers in numerical form, and | findstr :443 filters results for port 443 [16†L23-L28][3†L5-L7][3†L31-L32].

Map an unconventional external public port (e.g., https://company.com ) and create a that translates incoming traffic down to the server's local IP address on port 443. Strategy 3: Workload Isolation Common Culprits The most reliable solution is to

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Once the port configuration has been altered, it is essential to ensure that Veeam can successfully communicate and that the conflict is fully resolved.

If reconfiguration isn't feasible, you can temporarily stop the conflicting service during Veeam installation or upgrade. One user successfully tested this approach: "I was able to temporarily disable the service using 443 and successfully complete the upgrade to v13".