Data communicationb between computers

We have machines that are connected to each other by a wire. One  (A) is on the web and the other(B) is conected as a class C subnet of the machine on the web. Another machine (C) is a class C network of (B). We need to pass data from one to the other. any idea as to how to do this. All major ports would be closed in B and C like 80, 21 , 23 etc.

My options are
TCP/IP socket communoication - request a special port XXX to be opened
RMI but this runs on HTTP
....
anything else
Looking forward for your sugestions
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applekannaAsked:
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CEHJConnect With a Mentor Commented:
You simply have to have ports mutually visible, then connect with Sockets
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applekannaAuthor Commented:
>>Deleted and points NOT refunded as you have ignored the expert suggestion

y waste 100 points ;)
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