I have something running at port 9090 on my local machine.
It's probably something I set up long ago and forgot about... how can I find out what it is?
I am using Windows 8.
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Did you ever install Zeus admin server or Zyxel VoIP or CiscoSecure on that machine? Other possibilities include a Trojan such as Aphex's Remote Packet Sniffer or the IANA WebSM designation.
Take a look here or search the web for port 9090 or any other for that matter.
You can always do a basic intrusion testing using the GRC ShieldsUp! service.