$ ssh localhost -v
OpenSSH_7.6p1, OpenSSL 1.0.2m  2 Nov 2017
debug1: Reading configuration data /home/tdf/.ssh/config
debug1: Reading configuration data /etc/ssh_config
debug1: Connecting to localhost [::1] port 22.
debug1: Connection established.
debug1: key_load_public: No such file or directory
debug1: identity file /home/tdf/.ssh/id_rsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/tdf/.ssh/id_rsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/tdf/.ssh/id_dsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/tdf/.ssh/id_dsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/tdf/.ssh/id_ecdsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/tdf/.ssh/id_ecdsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/tdf/.ssh/id_ed25519 type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/tdf/.ssh/id_ed25519-cert type -1
debug1: Local version string SSH-2.0-OpenSSH_7.6
ssh_exchange_identification: read: Connection reset by peer