Public bug reported: Changing the sshd_config file to use exclusively the ed25519 host key type causes the server to reject all connections.
Excerpt from my config file: #HostKey /etc/ssh/ssh_host_rsa_key #HostKey /etc/ssh/ssh_host_ecdsa_key HostKey /etc/ssh/Japan_ssh_host_ed25519_key I tried setting each one individually then restarting the sshd service and it only states that the connection has been reset when I use ed25519. ProblemType: Bug DistroRelease: Ubuntu 17.10 Package: openssh-server 1:7.5p1-10ubuntu0.1 ProcVersionSignature: Ubuntu 4.13.0-25.29-generic 4.13.13 Uname: Linux 4.13.0-25-generic x86_64 ApportVersion: 2.20.7-0ubuntu3.7 Architecture: amd64 CurrentDesktop: ubuntu:GNOME Date: Sun Feb 4 04:36:44 2018 InstallationDate: Installed on 2017-11-30 (66 days ago) InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Release amd64 (20171018) ProcEnviron: TERM=xterm-256color PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=en_US.UTF-8 SHELL=/bin/bash SourcePackage: openssh UpgradeStatus: No upgrade log present (probably fresh install) ** Affects: openssh (Ubuntu) Importance: Undecided Status: New ** Tags: amd64 apport-bug artful wayland-session -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1747242 Title: All host keys work except ed25519 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/openssh/+bug/1747242/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs