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Sorry, but here runs GSA PR Emulator v1.21, no other resources are handled here.
You have to find out what program is listening on that port.
This can be very complicated and hard to figure out. The error message
shows you some typical programs that might block the program from
working as a web server. If you find them, stop or “kill” them with the
task manager. You can also try to use netstat. You can do that when
typing this netstat -b in the console (press start → Run → cmd [Enter]).
You can use CurrPorts,
a windows program by NirSoft that will list all used ports and the
program using it. It should be very easy to see what is running on the
IP/Port using this tool.