I had an issue where I couldn’t start a web server on a Windows Server as something was already listening on TCP Port 443.

netstat -a -b just showed me that something was listening on 0.0.0.0:443 but also said that it “Can not obtain ownership information”

Through some googling, a few people reported that the Routing and Remote Access service would attach to port 443.

I went into Services, stopped the service and set the startup to manual and then this freed up port 443 for the web server.