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

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When upgrading to or installing Veeam Backup & Replication (VBR) v13, many administrators encounter the error: "Required port 443 for Veeam Backup & Replication is occupied by another application". This occurs because port 443 is now hardcoded for the mandatory Veeam REST API Service and Web UI in version 13. Why Port 443 is Required

Need further assistance? Visit the official Veeam R&D Forums or open a support case with Veeam Customer Support. Include the output of veeamportssniffer.exe (available in the Veeam ISO tools folder) for rapid troubleshooting.

Preventative Measures: Avoiding Future Conflicts

  1. Install Veeam on a dedicated server – Do not stack Veeam on top of an existing IIS or RD Gateway server.
  2. Use a standard port assignment policy – Document that port 443 belongs to Veeam in your backup environment.
  3. During OS provisioning: Use Disable-NetFirewallRule and pre-configure HTTP.SYS reservations to ignore Veeam’s range.
  4. Leverage Veeam’s ‘Ports’ documentation – Veeam has a full list (e.g., 135, 445, 2500-3300, 6160) to avoid accidental overlaps.

Step 3 — Resolve the conflict (options)

Option A — Change/Remove the conflicting binding (recommended if feasible)

Web servers or Microsoft-related services like SQL Reporting Services often bind to this port. Other Web Servers:

netsh http delete urlacl url=http://+:443/
netsh http delete urlacl url=https://+:443/

Common Culprits: Frequently conflicting services include IIS (Internet Information Services), Hyper-V Replication, Remote Desktop Web Access, or third-party security agents like Qualys. Solutions and Workarounds

He stood up and walked down the cold aisle of the data center, the blue lights of the server racks casting long shadows. He stopped in front of the rack containing Repo-01. It was a sturdy Dell PowerEdge, purchased specifically for heavy storage throughput.

He held his breath. If the port was still blocked, it would fail instantly. Processing VM "SQL-01"...

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

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

When upgrading to or installing Veeam Backup & Replication (VBR) v13, many administrators encounter the error: "Required port 443 for Veeam Backup & Replication is occupied by another application". This occurs because port 443 is now hardcoded for the mandatory Veeam REST API Service and Web UI in version 13. Why Port 443 is Required

Need further assistance? Visit the official Veeam R&D Forums or open a support case with Veeam Customer Support. Include the output of veeamportssniffer.exe (available in the Veeam ISO tools folder) for rapid troubleshooting.

Preventative Measures: Avoiding Future Conflicts

  1. Install Veeam on a dedicated server – Do not stack Veeam on top of an existing IIS or RD Gateway server.
  2. Use a standard port assignment policy – Document that port 443 belongs to Veeam in your backup environment.
  3. During OS provisioning: Use Disable-NetFirewallRule and pre-configure HTTP.SYS reservations to ignore Veeam’s range.
  4. Leverage Veeam’s ‘Ports’ documentation – Veeam has a full list (e.g., 135, 445, 2500-3300, 6160) to avoid accidental overlaps.

Step 3 — Resolve the conflict (options)

Option A — Change/Remove the conflicting binding (recommended if feasible)

Web servers or Microsoft-related services like SQL Reporting Services often bind to this port. Other Web Servers:

netsh http delete urlacl url=http://+:443/
netsh http delete urlacl url=https://+:443/

Common Culprits: Frequently conflicting services include IIS (Internet Information Services), Hyper-V Replication, Remote Desktop Web Access, or third-party security agents like Qualys. Solutions and Workarounds

He stood up and walked down the cold aisle of the data center, the blue lights of the server racks casting long shadows. He stopped in front of the rack containing Repo-01. It was a sturdy Dell PowerEdge, purchased specifically for heavy storage throughput.

He held his breath. If the port was still blocked, it would fail instantly. Processing VM "SQL-01"...