Do you want to know if the problem you are having is a network \ firewall issue?
You can simply use Telnet to check if the port you are trying to connect to is open or not.
You can test any port using this simple method, not just connections open to telnet.
First off you need to install Telnet Client on your machine.
To do so, open a command prompt window. Click Start, type cmd in the Start Search box, and then press ENTER.
Next step close the current command prompt and reopen it again, this is so the path to Telnet which you’ve just installed will work.
Now type the connection & port to test
telnet <server> <port>
telnet google.co.uk 80
If it goes to a blank screen or a screen with funny characters then this means that port is open.
If you get :
Connecting To google.co.uk..Could not open connection to the host, on port 80:Connect failed
Then you’ll need to get onto your network team to open some firewall rules for the required port access or iptables if on unix servers.