SSH Server: I have installed cygwin 1.7.32 and configure sshd on my windows host. SSH Client : I use jsch-0.1.51.jar (latest) as my ssh client
When I try to establish an ssh session I get the following failure message. Exception Algorithm negotiation fail The following is my ssh client and server logs with debug option enabled. Has the OpenSSH server version shipped with cygwin changed recently ? Can someone suggest a workaround to get passed this issue ? SSH client logs. ============= JSCH LOG:INFO: : Remote version string: SSH-2.0-OpenSSH_6.7 JSCH LOG:INFO: : Local version string: SSH-2.0-JSCH-0.1.51 JSCH LOG:INFO: : CheckCiphers: aes256-ctr,aes192-ctr,aes128-ctr,aes256-cbc,aes192-cbc,aes128-cbc,3des-ctr,arcfour,arcfour128,arcfour256 JSCH LOG:INFO: : aes256-cbc is not available. JSCH LOG:INFO: : aes192-cbc is not available. JSCH LOG:INFO: : CheckKexes: diffie-hellman-group14-sha1 JSCH LOG:INFO: : diffie-hellman-group14-sha1 is not available. JSCH LOG:INFO: : SSH_MSG_KEXINIT sent JSCH LOG:INFO: : SSH_MSG_KEXINIT received JSCH LOG:INFO: : kex: server: curve25519-sha...@libssh.org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group14-sha1 JSCH LOG:INFO: : kex: server: ssh-rsa,ssh-dss,ecdsa-sha2-nistp256,ssh-ed25519 JSCH LOG:INFO: : kex: server: aes128-ctr,aes192-ctr,aes256-ctr,aes128-...@openssh.com,aes256-...@openssh.com,chacha20-poly1...@openssh.com JSCH LOG:INFO: : kex: server: aes128-ctr,aes192-ctr,aes256-ctr,aes128-...@openssh.com,aes256-...@openssh.com,chacha20-poly1...@openssh.com JSCH LOG:INFO: : kex: server: umac-64-...@openssh.com,umac-128-...@openssh.com,hmac-sha2-256-...@openssh.com,hmac-sha2-512-...@openssh.com,hmac-sha1-...@openssh.com,umac...@openssh.com,umac-...@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1 JSCH LOG:INFO: : kex: server: umac-64-...@openssh.com,umac-128-...@openssh.com,hmac-sha2-256-...@openssh.com,hmac-sha2-512-...@openssh.com,hmac-sha1-...@openssh.com,umac...@openssh.com,umac-...@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1 JSCH LOG:INFO: : kex: server: none,z...@openssh.com JSCH LOG:INFO: : kex: server: none,z...@openssh.com JSCH LOG:INFO: : kex: server: JSCH LOG:INFO: : kex: server: JSCH LOG:INFO: : kex: client: diffie-hellman-group1-sha1,diffie-hellman-group-exchange-sha1 JSCH LOG:INFO: : kex: client: ssh-rsa,ssh-dss JSCH LOG:INFO: : kex: client: aes128-ctr,aes128-cbc,3des-ctr,3des-cbc,blowfish-cbc JSCH LOG:INFO: : kex: client: aes128-ctr,aes128-cbc,3des-ctr,3des-cbc,blowfish-cbc JSCH LOG:INFO: : kex: client: hmac-md5,hmac-sha1,hmac-sha2-256,hmac-sha1-96,hmac-md5-96 JSCH LOG:INFO: : kex: client: hmac-md5,hmac-sha1,hmac-sha2-256,hmac-sha1-96,hmac-md5-96 JSCH LOG:INFO: : kex: client: none JSCH LOG:INFO: : kex: client: none JSCH LOG:INFO: : kex: client: JSCH LOG:INFO: : kex: client: JSCH LOG:INFO: : Disconnecting from xxx.xxx.com port 22 Exception Algorithm negotiation fail com.jcraft.jsch.JSchException: Algorithm negotiation fail SSH Server logs ============== debug1: Client protocol version 2.0; client software version JSCH-0.1.51 debug1: no match: JSCH-0.1.51 debug1: Enabling compatibility mode for protocol 2.0 debug1: Local version string SSH-2.0-OpenSSH_6.7 debug2: fd 3 setting O_NONBLOCK debug2: Network child is on pid 3664 debug3: preauth child monitor started debug1: list_hostkey_types: ssh-rsa,ssh-dss,ecdsa-sha2-nistp256,ssh-ed25519 [preauth] debug1: SSH2_MSG_KEXINIT sent [preauth] debug1: SSH2_MSG_KEXINIT received [preauth] debug2: kex_parse_kexinit: curve25519-sha...@libssh.org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman- group14-sha1 [preauth] debug2: kex_parse_kexinit: ssh-rsa,ssh-dss,ecdsa-sha2-nistp256,ssh-ed25519 [preauth] debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,aes128-...@openssh.com,aes256-...@openssh.com,chacha20-poly1...@openssh.com [preauth] debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,aes128-...@openssh.com,aes256-...@openssh.com,chacha20-poly1...@openssh.com [preauth] debug2: kex_parse_kexinit: umac-64-...@openssh.com,umac-128-...@openssh.com,hmac-sha2-256-...@openssh.com,hmac-sha2-512-...@openssh.com,hmac-sha1-...@openssh.com,uma c...@openssh.com,umac-...@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1 [preauth] debug2: kex_parse_kexinit: umac-64-...@openssh.com,umac-128-...@openssh.com,hmac-sha2-256-...@openssh.com,hmac-sha2-512-...@openssh.com,hmac-sha1-...@openssh.com,uma c...@openssh.com,umac-...@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1 [preauth] debug2: kex_parse_kexinit: none,z...@openssh.com [preauth] debug2: kex_parse_kexinit: none,z...@openssh.com [preauth] debug2: kex_parse_kexinit: [preauth] debug2: kex_parse_kexinit: [preauth] debug2: kex_parse_kexinit: first_kex_follows 0 [preauth] debug2: kex_parse_kexinit: reserved 0 [preauth] debug2: kex_parse_kexinit: diffie-hellman-group1-sha1,diffie-hellman-group-exchange-sha1 [preauth] debug2: kex_parse_kexinit: ssh-rsa,ssh-dss [preauth] debug2: kex_parse_kexinit: aes128-ctr,aes128-cbc,3des-ctr,3des-cbc,blowfish-cbc [preauth] debug2: kex_parse_kexinit: aes128-ctr,aes128-cbc,3des-ctr,3des-cbc,blowfish-cbc [preauth] debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,hmac-sha2-256,hmac-sha1-96,hmac-md5-96 [preauth] debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,hmac-sha2-256,hmac-sha1-96,hmac-md5-96 [preauth] debug2: kex_parse_kexinit: none [preauth] debug2: kex_parse_kexinit: none [preauth] debug2: kex_parse_kexinit: [preauth] debug2: kex_parse_kexinit: [preauth] debug2: kex_parse_kexinit: first_kex_follows 0 [preauth] debug2: kex_parse_kexinit: reserved 0 [preauth] debug2: mac_setup: setup hmac-sha1 [preauth] debug1: kex: client->server aes128-ctr hmac-sha1 none [preauth] debug2: mac_setup: setup hmac-sha1 [preauth] debug1: kex: server->client aes128-ctr hmac-sha1 none [preauth] Unable to negotiate a key exchange method [preauth] thanks, Prakash -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple
