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If you bring up putty.exe, does it have a saved entry for the particular remote host? That can be used to change the port number used to something other than port 22, and I think the above dialog in that case is misleading because it assumes the ssh command line system will use port 22 by default. In fact that's also true for OpenSSH, where a different port can be set in the config file. We'll try to clarify that in any case.
If that's not it, does it work to run plink.exe on the command line outside of to connect to the Rasp Pi without specifying the port number on the command line?