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IIS is listening port 80. I can't stop. I tried all possible methods.

  • Stopped World Wide Web publishing service.
  • Stopped IIS.

Nothing helps. PID 4 always uses port 80 according to netstat:

Running windows 7 x64

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migrated from Jul 27 '11 at 19:09

This question came from our site for professional and enthusiast programmers.

and pid 4 is what process? – matt b Jul 27 '11 at 19:06
-… - Hope it helps – user728708 Jul 27 '11 at 19:08
system.. i think it's IIS – Tural Teyyuboglu Jul 27 '11 at 19:08
up vote 1 down vote accepted

Are you sure it is IIS? It could be the Microsoft Web Deployment Service

Take a look at can-the-web-deploy-agent-run-on-a-port-other-than-80-on-iis6

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Not a programming question, but I will bite.

Sometimes processes can become "orphaned". When they are in this state, they will hold all systems resources open (file handles, sockets, etc.) The only way to release the resources is to reboot the machine.

Have you verified that the IIS process is killed on the machine? If it is, but NETSTAT -ao is still reporting that PID 4 has port 80, it is an orphaned process and the machine will require a reboot.

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HTTP.SYS is the kernel-mode listener for HTTP traffic, and if PID 4 is listening, that's probably HTTP.SYS.

IIS isn't the only consumer of HTTP.SYS - any process can register a URL namespace (eg, http://*:80/yourapphere), and HTTP.SYS will leave the port bound and ready to receive requests for that app.

PID 4 being the System 'process' is correct, because HTTP.SYS is a k-mode component, not a user-mode process.

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