Ever Find an answer to your problem?
I have had the same problem on a 3750X for over a year now. It is being replaced by a 9500-48.
It was working for me in putty.
Last Week, I set up the 9500, got it to work on ssh and on telnet.
upgraded the firmware and now it wont work with CLI analyzer or Putty.
This makes three different switches this has happened on. I can t seem to find an answer for it.
Telnet keeps working, console port works also.
Im guessing one of the old algorithms has been removed by Cisco and new one not added to CLI or PUTTY.