: Use the command Get-NetTCPConnection -LocalPort 443 to find the associated PID.
Scenario B: The Conflict is Caused by IIS (or Other Web Services)
Resolving Port 443 Conflicts in Veeam Backup & Replication Veeam Backup & Replication is the backbone of many disaster recovery strategies, but its installation or operation can come to a screeching halt when a "Port 443 occupied" error appears. Because Port 443 is the industry standard for HTTPS traffic, it is highly contested by web servers, monitoring tools, and communication platforms.
When another process binds to port 443 before Veeam starts, the Veeam Backup Service fails to initialize. This report outlines the causes, detection methods, and step-by-step resolution procedures. : Use the command Get-NetTCPConnection -LocalPort 443 to
Get-NetTCPConnection -LocalPort 443 | Select-Object LocalAddress, LocalPort, OwningProcess, State | Format-Table Use code with caution.
netsh http delete urlacl url=https://+:443/
Standard vCenter components frequently listen on this port. When another process binds to port 443 before
netstat -aon | findstr :443
If a temporary or non-essential application is hogging the port, kill it via Command Prompt using the PID you found in step 1: taskkill /PID /F Use code with caution. 4. Restart Veeam Services
Port 443 is critical for Veeam Backup & Replication. It handles secure HTTPS traffic between backup infrastructure components. When another application occupies this port, Veeam jobs fail, and management consoles lose connection. Resolving this conflict requires identifying the blocking application and reconfiguring either that application or Veeam. Why Veeam Requires Port 443 Veeam uses port 443 for several fundamental operations: Veeam jobs fail
: Veeam KB4557 advises that if third-party software is using the port, it is generally better to reconfigure that software rather than trying to modify Veeam's expected configuration. Summary of Resolution Steps
Several common applications frequently clash with Veeam over Port 443.