How to find which actual application uses port 80 via the System process


An application is listening on TCP port 80, but the process listed when I run netstat or TcpView from the SysInternals tools is System. I want to know which application is really listening on this port.

I have read this question, and tried running netstat, but it didn't help finding the actual application which uses port 80. The PID it gave me was 4, which corresponds to System. If I try to open a browser on localhost:80, it only gives me a basic 404 page ("HTTP Error 404. The requested resource is not found.").

I tried using a simple HTTP request via telnet, and I got the following:

                       HTTP/1.1 400 Bad Request Content-Type: text/html; charset=us-ascii Server: Microsoft-HTTPAPI/2.0 Date: Thu, 28 Jul 2016 19:22:42 GMT Connection: close Content-Length: 334  <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"""> <HTML><HEAD><TITLE>Bad Request</TITLE> <META HTTP-EQUIV="Content-Type" Content="text/html; charset=us-ascii"></HEAD> <BODY><h2>Bad Request - Invalid Hostname</h2> <hr><p>HTTP Error 400. The request hostname is invalid.</p> </BODY></HTML> 

Is there another way to find out which application is blocking my port 80 through the System process? I'm using Windows 7.


Here's an extract of the output when I run netstat -anbo | findstr :80:

TCP                 LISTENING       4 TCP               LISTENING       3900 TCP               LISTENING       2876 

And it's impossible to start our own HTTP server because port 80 is already in use.


If you download the Sysinternals Suite from Microsoft and extract it to somewhere, start the tool TCPCon.exe (or TCPMon) This will ist all the services and processes including PID and tons of other information. If the service is not self-explanatory, upload it to

Category: windows Time: 2016-07-28 Views: 0
Tags: windows port

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