Hi, I just want to let you know about a future change in the SSH client implementation. Full details https://twistedmatrix.com/trac/ticket/8100 Basically in order to work with OpenSSH version 6.9 and newer we will break support for very old (2004-2006) SSH servers which do not support RFC 4419 In case you care about Twisted SSH client interacting with very of SSH servers, please take a look and send your feedback over the Trac issue Otherwise, feel free to ignore and enjoy the rest of the day /night :) -- Adi Roiban