If the Telnet connection is going through a firewall that drops idle connections, a communication parameter may be set to send keepalive messages regularly to prevent the connection from being dropped. Serial with modem - user specified COM port and communication parameters.All communication cannot be viewed while on the network. SSH - an encrypted implementation of communication similar to Telnet.Rlogin - execution of single commands and displaying the results.Telnet with SSL - same as Raw and Telnet above, but communicated over an SSL connection. ![]() All data on the network is in plain-text which could be viewed by anyone with a network sniffer between the PC and the target server.
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