Suresh Yadav

Many time you have seen a error that port 80 is not availabe and used by another program, due to which your web server (apache in my case ) cannot statred. As you are not aware who is using port 80 and why.

Here are some steps for window to diagnose this issue:

1. Run command :  netstat -ano    This command list you details of all ports.  Basically information we needed are LOCAL ADDRESS and PID.
   As you can see in above image port 80 is used by PID (process id) 688.
2. Now open TaskManager on your windows andon process tab find out the PID. Against that PID you can see application name. If you are not able to see PID column in Process Tab (which is by default), for that you can choose 'Select columns' in 'View Menu' and choose PID to display.
3. Thats it you got the application which is using your port and can do what you want.