Diagnosing What Software is Using Port 80

If you are experiencing trouble determining what software is using port 80:

1. Run netstat -o from a command prompt. This will output a list of ports and the process ID using the port. In this example, process 4000 is using port 80.

   C:\Users\Admin>netstat -o
   
   Active Connections
   
     Proto  Local Address          Foreign Address       State        PID
     TCP    xxx.xxx.xxx.xxx:2492   blugro5relay:2492     ESTABLISHED  5232
     TCP    xxx.xxx.xxx.xxx:80     173:http              ESTABLISHED  4000
     TCP    xxx.xxx.xxx.xxx:80     173:http              ESTABLISHED  4000
     TCP    xxx.xxx.xxx.xxx:53405  cs115p1:5050          ESTABLISHED  1688
     TCP    xxx.xxx.xxx.xxx:53416  bos-m001c-rdr2:https  ESTABLISHED  1688
     TCP    xxx.xxx.xxx.xxx:53418  chat-d03b-rdr2:https  ESTABLISHED  1688
     TCP    xxx.xxx.xxx.xxx:53428  mtnradsvk1200:52230   ESTABLISHED  2076
     TCP    xxx.xxx.xxx.xxx:53442  pb-in-f125:5222       ESTABLISHED  4868
   
   C:\Users\Admin>

2. Open Windows Task Manager, switch to the Processes tab.
3. Click View > Select Columns... and ensure that PID (Process Identifier) is selected.
4. Sort the Windows Task Manager by the PID column to easily find the name of the process which is using port 80.