Often used for other web applications on the same server.
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The Windows HTTP Service (HTTP.sys) can occupy port 443 at the kernel level. Components like Routing and Remote Access Service (RRAS) and Active Directory Federation Services (ADFS) use this driver, with the SYSTEM process (PID 4) holding the port. Often used for other web applications on the same server
Exposes infrastructure endpoints for automation and third-party monitoring tools. Often used for other web applications on the same server
Veeam service logs provide detailed information about port binding attempts. Look for logs in:
Allow your conflicting internal application to run natively on port 443 inside the server OS.