How to check your network port is open

You can check network port is open in your computer (network port may be close by firewall block this port) .
However you can check your port is available for your computer connection in:

1. Open Command Prompt
http://durion.blogspot.com/2007/09/how-to-use-command-prompt-on-ms-windows.html

2. Type command
telnet X.X.X.X PP

X.X.X.X = your IP Address
you can check your IP Address
http://durion.blogspot.com/2007/09/check-ip-address-on-windows-system.html

PP = Network Port
80 = HTTP (to access Website)
21 = FTP (to access File Transfer)
25 = SMTP (to access E-Mail)
Etc.

3. If no problem, the result may be blank or show something

4. If port is unavailable or not open, the resut show as
Connecting To X.X.X.X ... Could not open connection to the host, on port PP: connect failed