I just upgraded my current/amd64 and now con't ssh to it
from an amd64 machien running the Jan 19 snapshot:
$ ssh -v biblio.stare.cz
OpenSSH_7.6, LibreSSL 2.7.0
debug1: Reading configuration data /home/hans/.ssh/config
debug1: /home/hans/.ssh/config line 1: Applying options for *
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: Connecting to biblio.stare.cz [147.32.233.137] port 22.
debug1: Connection established.
debug1: identity file /home/hans/.ssh/id_rsa type 0
debug1: key_load_public: No such file or directory
debug1: identity file /home/hans/.ssh/id_rsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/hans/.ssh/id_dsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/hans/.ssh/id_dsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/hans/.ssh/id_ecdsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/hans/.ssh/id_ecdsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/hans/.ssh/id_ed25519 type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/hans/.ssh/id_ed25519-cert type -1
debug1: Local version string SSH-2.0-OpenSSH_7.6
debug1: Remote protocol version 2.0, remote software version OpenSSH_7.6
debug1: match: OpenSSH_7.6 pat OpenSSH* compat 0x04000000
debug1: Authenticating to biblio.stare.cz:22 as 'hans'
debug1: SSH2_MSG_KEXINIT sent
Bad packet length 1349676916.
ssh_dispatch_run_fatal: Connection to 147.32.233.137 port 22: message
authentication code incorrect
Jan
