... 2. I am not sure if this helps. What I mean by this is that NETSTAT may show that the 0.0.0.0 is LISTENING on port 3306 but a firewall may still be blocking that port which is preventing outside connections; so it isn't sufficient to rely on NETSTAT alone. Once someone attempts to connect to the ssh daemon it forks a copy of itself and pushes that connection off to another port, keeping TCP port 22 open for additional connections as they come in. you can set a target and a port number and it will tell you if this port is open or not. Now my PC is behind PIX 515 & Cisco router. What I need to do is something similar but test if my outbound request to a given IP Address as well as a specif port (in the present case 1775) is successful. How to Check if SMTP Port 587 is Not Blocked 1. NETSTAT will tell you if the port is listening but it will not tell you if the port is open to the outside world. It can be used to check open ports or Ping a Port on a remote server. Step 1 — Opening up your computer's console. port # 27705 must be open towards the software server. So in the case of port 22, that's the ssh daemon running on my system, that's LISTENING for connections. Kindly advice how can I check that my PC / PIX / Cisco Router is open towards the software server with the port 27705. (Ensure that the TCP port 27705 is open towards the chosen server). This process is different, depending on the operating system your computer is using: Windows. Is there some kind of utility that I can run or a website that I can go to to determine if a certain port (port 389) is open? The open port checker is a tool you can use to check your external IP address and detect open ports on your connection. Check if port is open using online tools: On our main website, we have a tool that you can use just for that. Go haad and test it. Why not give it a try. Port Checker is an online tool which checks a remote computer or device accessibility from the Internet. How can I test to find out if port 389 is open on a company's firewall? OK, we all know how to use PING to test connectivity to an IP address. This may not work in your case as the you are trying to connect to will have to have that port open in it's firewall. But it will give you a place to start looking. TCP Port Checker tries to establish connection from our server and if the connection is successful, you should be able to see it. Pls let me know if you need pix & router configs. This tool is useful for finding out if your port forwarding is setup correctly or if your server applications are being blocked by a firewall.