4.1.1 The host name section
The top box on the Session panel, labelled ‘Specify your connection by host name’, contains the details that need to be filled in before PuTTY can open a session at all.
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The ‘Host Name’ box is where you type the name, or the IP address, of the server you want to connect to.
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The ‘Connection type’ radio buttons let you choose what type of connection you want to make: a raw connection, a Telnet connection, an Rlogin connection, an SSH connection, or a connection to a local serial line. (See section 1.2 for a summary of the differences between SSH, Telnet and rlogin; see section 3.6 for an explanation of ‘raw’ connections; see section 3.7 for information about using a serial line.)
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The ‘Port’ box lets you specify which port number on the server to connect to. If you select Telnet, Rlogin, or SSH, this box will be filled in automatically to the usual value, and you will only need to change it if you have an unusual server. If you select Raw mode, you will almost certainly need to fill in the ‘Port’ box yourself.
If you select ‘Serial’ from the ‘Connection type’ radio buttons, the ‘Host Name’ and ‘Port’ boxes are replaced by ‘Serial line’ and ‘Speed’; see section 4.25 for more details of these.