This isn't an OpenSSH bug, but just in case anyone else is ambitious enough to automatically run interoperability tests against other SSH implementations, here's a heads-up: https://twistedmatrix.com/trac/ticket/9515 The problem is that ssh-keygen now generates new-format private keys by default, but conch can't read them. It's possible to work around this by using -m PEM in the test suite as follows, and then everything works fine: https://salsa.debian.org/ssh-team/openssh/commit/38966b4afedee3bb57d3b1b0a7df4ff438fb9fd0 I'm not proposing to do this upstream, though, as long-term it's better that the interop tests check that conch can read the current private key format. I plan to revert this in Debian as soon as I've got a patch landed upstream and cherry-picked into the Debian Twisted packages. -- Colin Watson [cjwatson at debian.org]