Port 80 In Use

Attempting to run Apache 2.2.9 on a freshly updated system; can't get it to start, however, as something else appears to be holding port 80 and is denying a socket connection. I haven't any idea what service it is, other than what I can garner from
a quick probe via a telnet client:
HTTP/1.1 400 Bad Request
Content-Type: text/html; charset=us-ascii
Server: Microsoft-HTTPAPI/2.0
Date: Wed, 04 Feb 2015 15:12:57 GMT
Connection: close
Content-Length: 326
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN""http://www.w3.org/TR/html4/strict.dtd">
<HTML><HEAD><TITLE>Bad Request</TITLE>
<META HTTP-EQUIV="Content-Type" Content="text/html; charset=us-ascii"></HEAD>
<BODY><h2>Bad Request - Invalid Verb</h2>
<hr><p>HTTP Error 400. The request verb is invalid.</p>
</BODY></HTML>
netstat -ao identifies it as PID 4, but that's simply "System", so it leads nowhere.
Older information mentioned this could be the Web Deployment Agent Service but this doesn't appear to exist in Win10. There's no good information in the Firewall or Event Viewer.

Hi,
The TCP port: 80 is used by System by default. For your problem, is there any detailed error message with this problem?
In my opininon, it would be better to use Process Monitor to captuer the Apache start process to find the reason of this problem.
You can access to the link below to download Process Monitor:
https://technet.microsoft.com/en-us/sysinternals/bb896645.aspx
How to capture a Process Monitor trace:
http://blogs.msdn.com/b/dswl/archive/2010/01/10/how-to-capture-a-process-monitor-trace.aspx
Learning Example:
Using Process Monitor to Troubleshoot and Find Registry Hacks:
http://www.howtogeek.com/school/sysinternals-pro/lesson5/all/
Note: Since the website is not hosted by Microsoft, the link may change without notice. Microsoft does not guarantee the accuracy of this information.
On the other hand, if your doubt the port 80 was using by other unknown process, it would be better to use Network Monitor to capture the trace of port 80.
Roger Lu
TechNet Community Support

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