PID:4 using Port 80

I was trying to install Zend Server CE on my computer but when I got to the point were I need to choose the port for my Web Server it says: "Web Server Port: 80 Occupied". So I decided to check what is using Port 80 with CMD by typing: "netstat -o -n -a | findstr 0.0:80":

TCP     0.0.0.0:80     0.0.0.0:0     LISTENING     4

I check for PID:4 in Task Manager's Processes and Services. Seems PID 4 is "System".

So, what I want to know is how can I stop "System" (PID:4) from using Port 80?

INFO: I am using: Windows 7 64bit; Zend Server CE 5.5.0

Ok, after searching the web for a while I found a solution to my problem.

Just follow these steps to diagnose and resolve your issue:

1. Get pid that is listening port 80: netstat -nao | find ":80"

2. Open task manager, go to processes tab and check “PID” in Menu/View/Select Columns…, then look for the process using the PID found in last step.

3. If it is a normal application or IIS, disable it or uninstall. Some programs (such as Skype) have the option to disable its use of port 80.

4. If it is a System Process—PID 4—you need to disable the HTTP.sys driver which is started on demand by another service, such as Windows Remote Management or Print Spooler on Windows 7 or 2008.

   There is two ways to disable it but the first one is safer:

   1.

   • Go to device manager, select “show hidden devices” from menu/view, go to “Non-Plug and Play Driver”/HTTP, double click it to disable it (or set it to manual, some services depended on it).

   • Reboot and use netstat -nao | find ":80" to check if 80 is still used.

   2.

   • Launch RegEdit.

   • Go to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\HTTP

   • Change the value of "start" to 4, which means disabled.

   • Reboot your computer.

My solution was step 4.

I just had this issue after installing Windows 8 Pro - Build 9200. I tried several methods but couldn't get any of them to work. This one, however, fixed it.

You need to change the binded IP address for HTTP.SYS

netsh http add iplisten ipaddress=::

http://www.mikeplate.com/2011/11/06/stop-http-sys-from-listening-on-port-80-in-windows/