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PuTTY currently supports the following varieties of Diffie-Hellman key exchange:
‘Group 14’: a well-known 2048-bit group.
‘Group 1’: a well-known 1024-bit group. This is less secure than group 14, but may be faster with slow client or server machines, and may be the only method supported by older server software.
‘Group exchange’: with this method, instead of using a fixed group, PuTTY requests that the server suggest a group to use for key exchange; the server can avoid groups known to be weak, and possibly invent new ones over time, without any changes required to PuTTY's configuration. We recommend use of this method, if possible.
In addition, PuTTY supports RSA key exchange, which requires much less computational effort on the part of the client, and somewhat less on the part of the server, than Diffie-Hellman key exchange.
I did some digging and looking at the supported key exchange algorithms by putty and the one your trying to use isn't really showing up. Have you tried the nightly builds of putty, they may have some added support for this version.
See I thought that it was a key exchange BEFORE the encryption to start the encrypted session. Thus the name KEXAlgorithm its a Key EXchange algorithm to security transmit the actual keys for encryption before the data is passed, so by definition they are key exchange algorithms