Scoring: completeness, correctness, concise technical detail.
If you receive a compatibility check error stating that a conflicting service is using port 443 while trying to upgrade from v12 to v13, follow this solution:
This is the most common fix.
As John was trying to troubleshoot the issue, his phone started ringing. The company's CEO was on the line, asking about a critical server that was supposed to be backed up the previous night. John explained the situation, and the CEO stressed the importance of getting the backups up and running as soon as possible.
Scenario 2 — HTTP.sys reservation by a management agent (no visible service)
If you are upgrading from an older version, ensure you have checked the database compatibility level as well. If you'd like, I can:
Fixing the "Port 443 Occupied" Error in Veeam Backup & Replication
Change the from 443 to a different port (e.g., 444).
Port 443 is the standard TCP port used for HTTPS (secure web traffic). Veeam requires this port for various components—most notably the and the Veeam Backup Service on the backup repository—to enable secure communication between the console, the server, and managed agents.
Or in PowerShell:
Note: If you are using WSUS, you may need to reconfigure the WSUS configuration via the WSUS setup wizard to utilize a custom port like 8531.
: If your VBR server is also a Hyper-V host with replication enabled, it often claims 443.
Security agents (e.g., Datadog), VMware Workstation services, or communication tools like Skype. How to Find the Blocker
Scoring: completeness, correctness, concise technical detail.
If you receive a compatibility check error stating that a conflicting service is using port 443 while trying to upgrade from v12 to v13, follow this solution:
This is the most common fix.
As John was trying to troubleshoot the issue, his phone started ringing. The company's CEO was on the line, asking about a critical server that was supposed to be backed up the previous night. John explained the situation, and the CEO stressed the importance of getting the backups up and running as soon as possible.
Scenario 2 — HTTP.sys reservation by a management agent (no visible service)
If you are upgrading from an older version, ensure you have checked the database compatibility level as well. If you'd like, I can:
Fixing the "Port 443 Occupied" Error in Veeam Backup & Replication
Change the from 443 to a different port (e.g., 444).
Port 443 is the standard TCP port used for HTTPS (secure web traffic). Veeam requires this port for various components—most notably the and the Veeam Backup Service on the backup repository—to enable secure communication between the console, the server, and managed agents.
Or in PowerShell:
Note: If you are using WSUS, you may need to reconfigure the WSUS configuration via the WSUS setup wizard to utilize a custom port like 8531.
: If your VBR server is also a Hyper-V host with replication enabled, it often claims 443.
Security agents (e.g., Datadog), VMware Workstation services, or communication tools like Skype. How to Find the Blocker