|If 2 pc's are on a LAN and attached to the same hub where does port blocking take place?|
First of all, I believe you mean "switch" not hub. Nobody uses hubs anymore. I suggest you quickly google and compare the two so you have a basic understanding of what each device is, what it does, and how they differ. This will give you an understanding of why nobody uses hubs anymore and you won't in the future refer to a switch as a hub. Yeah, I know this is a little "nit picky" but even though a Ford and a Chev are both automobiles, you don't call a Ford a Chevy right.
Having said that, I don't know of any switches that do "port blocking" in the sense you mean it.
I need to get communication between them over 2939 for my devices to work but the IT guy says that nothing is being blocked. I
While nobody is perfect, I suspect your IT guy is giving you the straight goods. What kind of devices are you talking about and why do they use 2939?
I loaded C-Ports on both pc and it shows nothing for 2939..
Ok, this confirms what your IT guy told you. So, you've ruled out "port blocking" so where does that leave you........with the devices you're trying to use, or the software that you use to interface with them.
Telnet wont work between them either.
Telnet uses port 23 by default, not 2939. Are you sure those PC's are setup to allow telnet connections? If they're windows based PC's to the best of my knowledge they do not accept telnet sessions by default. So unless you've fixed it so those PC's can accept an incoming telnet session, it only makes sense that telnet won't work.
It matters not how straight the gate,
How charged with punishments the scroll,
I am the master of my fate;
I am the captain of my soul.