[Bug 1450085] Re: kio_sftp can't connect to hosts after OpenSSH 6 has cached their ECDSA key

[aslam karachiwala]

I started with a fresh ~/.ssh/known_hosts and first tried connecting to
a a remote machine using SFTP in Dolphin. The record this wrote to
~/.ssh/known_hosts begins with "[hostname]:port ssh-rsa". Apparently,
SFTP in Kubuntu 15.04 does not handle ECDSA keys, which are what SSH
creates by default. However, SSH does seem to handle RSA keys, I was
able to connect to the remote machine with the key.

The workaround is to first connect using SFTP to any remote machine if
you need to connect to it using both SSH and SFTP.

Incidentally, I did build and install libssh from the latest source (v.
0.7.1), which made no difference. The libssh.org site
(https://www.libssh.org/documentation/) says, "KDE uses libssh to
implement the sftp module to allow secure file transfers between
different computers." That doesn't appear to be true at least in Kubuntu
15.04.

More on this bug here: https://bugs.kde.org/show_bug.cgi?id=274170

** Bug watch added: KDE Bug Tracking System #274170
   https://bugs.kde.org/show_bug.cgi?id=274170

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Title:
  kio_sftp can't connect to hosts after OpenSSH 6 has cached their ECDSA
  key

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