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SupermanTB

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Looking for open port with Telnet

I've used Telnet to check for open ports.  My question is does a service have to be listening and responding in order for telnet to connect?  Ideally I'm trying to find a way to just see if a port is open.  

I have a 3rd party vendor with equipment that they are trying to reach from the outside.  They are pointing the finger at me saying there is a problem with the firewall.  I think their equipment is not listening.

Can telnet discern whether a port is open vs. a port that is open with something listening?  If not, any other way to tell?
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Avatar of Dan Craciun
Dan Craciun
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