| 摘要 |
The invention provides a data communication system in which a private IP terminal (client terminal) 40 arranged on a private network within a firewall makes connection to a public server 50 by automatically searching for a communication path capable of passing through the firewall. The terminal arranged within the firewall is provided with path search means for automatically searching for a combination of a connection type, a port number, and a communication protocol capable of passing through the firewall by attempting connection to the public server 50 while successively modifying the combination of the connection type, the port number, and the communication protocol, and data communication means for performing data communication by forming a communication path with the public server 50 based on the searched combination of the connection type, the port number, and the communication protocol.
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