all but one lan host (gv)can ssh connect to host 2x Included windows 10, several linux. 2x is a solaris host. That problem host (gv) can connect to all others but 2x. 2x can connect to all other encluding the problem host (gv) So gv ssh to 2x throws this error: ssh_dispatch_run_fatal: Connection to 192.168.1.42 port 22: incorrect signature. 192.168.1.42 is 2x. So incoming ssh from gv to 2x has the problem. So far I have removed all ssh config and files on both hosts and reinstalled openssh. The problem remains Below is the full output of ssh -vv gv (a gentoo host) ssh to 2x (a solaris <openindian> host). gv harry> ssh -vv 2x OpenSSH_7.3p1-hpn14v11, OpenSSL 1.0.2j 26 Sep 2016 debug1: Reading configuration data /etc/ssh/ssh_config Pseudo-terminal will not be allocated because stdin is not a terminal. debug2: resolving "2x" port 22 debug2: ssh_connect_direct: needpriv 0 debug1: Connecting to 2x [192.168.1.42] port 22. debug1: Connection established. debug1: key_load_public: No such file or directory debug1: identity file /home/harry/.ssh/id_rsa type -1 debug1: key_load_public: No such file or directory debug1: identity file /home/harry/.ssh/id_rsa-cert type -1 debug1: key_load_public: No such file or directory debug1: identity file /home/harry/.ssh/id_dsa type -1 debug1: key_load_public: No such file or directory debug1: identity file /home/harry/.ssh/id_dsa-cert type -1 debug1: key_load_public: No such file or directory debug1: identity file /home/harry/.ssh/id_ed25519 type -1 debug1: key_load_public: No such file or directory debug1: identity file /home/harry/.ssh/id_ed25519-cert type -1 debug1: Enabling compatibility mode for protocol 2.0 debug1: Local version string SSH-2.0-OpenSSH_7.3p1-hpn14v11 debug1: Remote protocol version 2.0, remote software version OpenSSH_6.6 debug1: match: OpenSSH_6.6 pat OpenSSH_6.5*,OpenSSH_6.6* compat 0x14000000 debug1: Remote is NON-HPN aware debug2: fd 3 setting O_NONBLOCK debug1: Authenticating to 2x:22 as 'harry' debug2: compat_kex_proposal: original KEX proposal: curve25519-sha256@xxxxxxxxxx,diffie-hellman-group-exchange-sha256,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha256,diffie-hellman-group14-sha1,ext-info-c debug2: Compat: skipping algorithm "curve25519-sha256@xxxxxxxxxx" debug2: compat_kex_proposal: compat KEX proposal: diffie-hellman-group-exchange-sha256,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha256,diffie-hellman-group14-sha1,ext-info-c debug1: SSH2_MSG_KEXINIT sent debug1: SSH2_MSG_KEXINIT received debug1: AUTH STATE IS 0 debug2: local client KEXINIT proposal debug2: KEX algorithms: diffie-hellman-group-exchange-sha256,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha256,diffie-hellman-group14-sha1,ext-info-c debug2: host key algorithms: ssh-ed25519-cert-v01@xxxxxxxxxxx,ssh-ed25519,ssh-rsa-cert-v01@xxxxxxxxxxx,rsa-sha2-512,rsa-sha2-256,ssh-rsa debug2: ciphers ctos: chacha20-poly1305@xxxxxxxxxxx,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@xxxxxxxxxxx,aes256-gcm@xxxxxxxxxxx,aes128-cbc,aes192-cbc,aes256-cbc,3des-cbc debug2: ciphers stoc: chacha20-poly1305@xxxxxxxxxxx,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@xxxxxxxxxxx,aes256-gcm@xxxxxxxxxxx,aes128-cbc,aes192-cbc,aes256-cbc,3des-cbc debug2: MACs ctos: umac-64-etm@xxxxxxxxxxx,umac-128-etm@xxxxxxxxxxx,hmac-sha2-256-etm@xxxxxxxxxxx,hmac-sha2-512-etm@xxxxxxxxxxx,hmac-sha1-etm@xxxxxxxxxxx,umac-64@xxxxxxxxxxx,umac-128@xxxxxxxxxxx,hmac-sha2-256,hmac-sha2-512,hmac-sha1 debug2: MACs stoc: umac-64-etm@xxxxxxxxxxx,umac-128-etm@xxxxxxxxxxx,hmac-sha2-256-etm@xxxxxxxxxxx,hmac-sha2-512-etm@xxxxxxxxxxx,hmac-sha1-etm@xxxxxxxxxxx,umac-64@xxxxxxxxxxx,umac-128@xxxxxxxxxxx,hmac-sha2-256,hmac-sha2-512,hmac-sha1 debug2: compression ctos: none,zlib@xxxxxxxxxxx,zlib debug2: compression stoc: none,zlib@xxxxxxxxxxx,zlib debug2: languages ctos: debug2: languages stoc: debug2: first_kex_follows 0 debug2: reserved 0 debug2: peer server KEXINIT proposal debug2: KEX algorithms: curve25519-sha256@xxxxxxxxxx,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1 debug2: host key algorithms: ssh-rsa,ssh-dss,ecdsa-sha2-nistp256,ssh-ed25519 debug2: ciphers ctos: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-gcm@xxxxxxxxxxx,aes256-gcm@xxxxxxxxxxx,chacha20-poly1305@xxxxxxxxxxx,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,rijndael-cbc@xxxxxxxxxxxxxx debug2: ciphers stoc: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-gcm@xxxxxxxxxxx,aes256-gcm@xxxxxxxxxxx,chacha20-poly1305@xxxxxxxxxxx,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,rijndael-cbc@xxxxxxxxxxxxxx debug2: MACs ctos: hmac-md5-etm@xxxxxxxxxxx,hmac-sha1-etm@xxxxxxxxxxx,umac-64-etm@xxxxxxxxxxx,umac-128-etm@xxxxxxxxxxx,hmac-sha2-256-etm@xxxxxxxxxxx,hmac-sha2-512-etm@xxxxxxxxxxx,hmac-ripemd160-etm@xxxxxxxxxxx,hmac-sha1-96-etm@xxxxxxxxxxx,hmac-md5-96-etm@xxxxxxxxxxx,hmac-md5,hmac-sha1,umac-64@xxxxxxxxxxx,umac-128@xxxxxxxxxxx,hmac-sha2-256,hmac-sha2-512,hmac-ripemd160,hmac-ripemd160@xxxxxxxxxxx,hmac-sha1-96,hmac-md5-96 debug2: MACs stoc: hmac-md5-etm@xxxxxxxxxxx,hmac-sha1-etm@xxxxxxxxxxx,umac-64-etm@xxxxxxxxxxx,umac-128-etm@xxxxxxxxxxx,hmac-sha2-256-etm@xxxxxxxxxxx,hmac-sha2-512-etm@xxxxxxxxxxx,hmac-ripemd160-etm@xxxxxxxxxxx,hmac-sha1-96-etm@xxxxxxxxxxx,hmac-md5-96-etm@xxxxxxxxxxx,hmac-md5,hmac-sha1,umac-64@xxxxxxxxxxx,umac-128@xxxxxxxxxxx,hmac-sha2-256,hmac-sha2-512,hmac-ripemd160,hmac-ripemd160@xxxxxxxxxxx,hmac-sha1-96,hmac-md5-96 debug2: compression ctos: none,zlib@xxxxxxxxxxx debug2: compression stoc: none,zlib@xxxxxxxxxxx debug2: languages ctos: debug2: languages stoc: debug2: first_kex_follows 0 debug2: reserved 0 debug1: kex: algorithm: diffie-hellman-group-exchange-sha256 debug1: kex: host key algorithm: ssh-ed25519 debug1: REQUESTED ENC.NAME is 'chacha20-poly1305@xxxxxxxxxxx' debug1: kex: server->client cipher: chacha20-poly1305@xxxxxxxxxxx MAC: <implicit> compression: none debug1: REQUESTED ENC.NAME is 'chacha20-poly1305@xxxxxxxxxxx' debug1: kex: client->server cipher: chacha20-poly1305@xxxxxxxxxxx MAC: <implicit> compression: none debug1: SSH2_MSG_KEX_DH_GEX_REQUEST(2048<8192<8192) sent debug1: got SSH2_MSG_KEX_DH_GEX_GROUP debug2: bits set: 4070/8192 debug1: SSH2_MSG_KEX_DH_GEX_INIT sent debug1: got SSH2_MSG_KEX_DH_GEX_REPLY debug1: Server host key: ssh-ed25519 SHA256:fDVJdFDNtnMrobEPdtuoLTTTXju1T+V+aKRGdI5Yook debug1: Host '2x' is known and matches the ED25519 host key. debug1: Found key in /home/harry/.ssh/known_hosts:2 debug2: bits set: 4134/8192 debug2: ssh_ed25519_verify: crypto_sign_ed25519_open failed: -1 ssh_dispatch_run_fatal: Connection to 192.168.1.42 port 22: 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