
Just type the following command to Telnet to the system in port 80 or 443: Identify which process or application is using the port by matching the PID against PID number in Task Manager.Īnother alternative to determine and identify which application is using port 80 or 443 is by using Telnet application.The last column of each row is the process identified (process ID or PID). The following line(s) of results should be returned:.Note: The last command will list all connection that is listening, established, starting, closing and all other states, so the list is long, and user has to manually search for rows that has connection originating or targeting to 1270.0.1:80/443 or 0.0.0.0.80/443.



After installing Apache HTTPD web server or Microsoft IIS Internet Information Services web server, or any other application software or service and daemon that requires to open and listen to port 80 (HTTP) or port 443 (HTTPS SSL), it’ll be a surprise if some other application or processes have stolen, used and occupied port 80 and/or 443.
