How to tell what ports are being used so that I can avoid our Cisco Firewall blocking them?
Posted on 2008-09-30
We are going to put our servers behind a cisco ASA firewall and I would like to know whats the easiest way of finding out which ports are currently being used on our Windows 2003 machines. In theory I can research online to see each software that we run what port it uses (and close everything else), but in practice this will definitely mean we will "forget" some ports and so our applications/services will not work.
Other than the standard and well known port 80, 21 and so on so forth, is there an application I can use to show me which ports are currently being used?