Question: ssh slow connection to solaris 10 and 11 hosts , how to solve this ?
Answer : Normally in Linux hosts we solve ssh delay issue by disabling most of the server-side lookups by setting UseDNS no in sshd_config. This solution doesn`t seem to work in Unix based systems.
let give a verbose connexion example between my Ubuntu and Solaris 11 :
pirat9@HP ~ $ ssh -v pirat9@192.168.1.134 OpenSSH_5.9p1 Debian-5ubuntu1, OpenSSL 1.0.1 14 Mar 2012 debug1: Reading configuration data /etc/ssh/ssh_config debug1: /etc/ssh/ssh_config line 19: Applying options for * debug1: Connecting to 192.168.1.134 [192.168.1.134] port 22. debug1: Connection established. debug1: identity file /home/pirat9/.ssh/id_rsa type 1 debug1: Checking blacklist file /usr/share/ssh/blacklist.RSA-2048 debug1: Checking blacklist file /etc/ssh/blacklist.RSA-2048 debug1: identity file /home/pirat9/.ssh/id_rsa-cert type -1 debug1: identity file /home/pirat9/.ssh/id_dsa type -1 debug1: identity file /home/pirat9/.ssh/id_dsa-cert type -1 debug1: identity file /home/pirat9/.ssh/id_ecdsa type -1 debug1: identity file /home/pirat9/.ssh/id_ecdsa-cert type -1 debug1: Remote protocol version 2.0, remote software version Sun_SSH_1.5 debug1: no match: Sun_SSH_1.5 debug1: Enabling compatibility mode for protocol 2.0 debug1: Local version string SSH-2.0-OpenSSH_5.9p1 Debian-5ubuntu1 debug1: SSH2_MSG_KEXINIT sent debug1: SSH2_MSG_KEXINIT received debug1: kex: server->client aes128-ctr hmac-md5 none debug1: kex: client->server aes128-ctr hmac-md5 none debug1: SSH2_MSG_KEX_DH_GEX_REQUEST(1024<1024<8192) sent debug1: expecting SSH2_MSG_KEX_DH_GEX_GROUP debug1: SSH2_MSG_KEX_DH_GEX_INIT sent debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY debug1: Server host key: RSA c8:05:c3:8a:80:47:3b:9b:e1:e1:a2:c8:90:ff:93:e1 debug1: Host '192.168.1.134' is known and matches the RSA host key. debug1: Found key in /home/pirat9/.ssh/known_hosts:6 debug1: ssh_rsa_verify: signature correct debug1: SSH2_MSG_NEWKEYS sent debug1: expecting SSH2_MSG_NEWKEYS debug1: SSH2_MSG_NEWKEYS received debug1: Roaming not allowed by server debug1: SSH2_MSG_SERVICE_REQUEST sent debug1: SSH2_MSG_SERVICE_ACCEPT received debug1: Authentications that can continue: gssapi-keyex,gssapi-with-mic,publickey,password,keyboard-interactive debug1: Next authentication method: gssapi-keyex debug1: No valid Key exchange context debug1: Next authentication method: gssapi-with-mic
you can prevent SSH from trying GSS API Authentication. Just add the the following option :
ssh -o GSSAPIAuthentication=no -l user hostname
Or  add to sshd_config
Host hostname GSSAPIAuthentication no <code>LookupClientHostnames no VerifyReverseMapping no
Restart SSH Server
#svcadm disable ssh #svcadm enable ssh OR # svcadm restart ssh
Try to connect again :
pirat9@HP ~ $ ssh -v -o GSSAPIAuthentication=no -l pirat9Â 192.168.1.134 OpenSSH_5.9p1 Debian-5ubuntu1, OpenSSL 1.0.1 14 Mar 2012 debug1: Reading configuration data /etc/ssh/ssh_config debug1: /etc/ssh/ssh_config line 19: Applying options for * debug1: Connecting to 192.168.1.134 [192.168.1.134] port 22. debug1: Connection established. debug1: identity file /home/pirat9/.ssh/id_rsa type 1 debug1: Checking blacklist file /usr/share/ssh/blacklist.RSA-2048 debug1: Checking blacklist file /etc/ssh/blacklist.RSA-2048 debug1: identity file /home/pirat9/.ssh/id_rsa-cert type -1 debug1: identity file /home/pirat9/.ssh/id_dsa type -1 debug1: identity file /home/pirat9/.ssh/id_dsa-cert type -1 debug1: identity file /home/pirat9/.ssh/id_ecdsa type -1 debug1: identity file /home/pirat9/.ssh/id_ecdsa-cert type -1 debug1: Remote protocol version 2.0, remote software version Sun_SSH_1.5 debug1: no match: Sun_SSH_1.5 debug1: Enabling compatibility mode for protocol 2.0 debug1: Local version string SSH-2.0-OpenSSH_5.9p1 Debian-5ubuntu1 debug1: SSH2_MSG_KEXINIT sent debug1: SSH2_MSG_KEXINIT received debug1: kex: server->client aes128-ctr hmac-md5 none debug1: kex: client->server aes128-ctr hmac-md5 none debug1: SSH2_MSG_KEX_DH_GEX_REQUEST(1024<1024<8192) sent debug1: expecting SSH2_MSG_KEX_DH_GEX_GROUP debug1: SSH2_MSG_KEX_DH_GEX_INIT sent debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY debug1: Server host key: RSA c8:05:c3:8a:80:47:3b:9b:e1:e1:a2:c8:90:ff:93:e1 debug1: Host '192.168.1.134' is known and matches the RSA host key. debug1: Found key in /home/pirat9/.ssh/known_hosts:6 debug1: ssh_rsa_verify: signature correct debug1: SSH2_MSG_NEWKEYS sent debug1: expecting SSH2_MSG_NEWKEYS debug1: SSH2_MSG_NEWKEYS received debug1: Roaming not allowed by server debug1: SSH2_MSG_SERVICE_REQUEST sent debug1: SSH2_MSG_SERVICE_ACCEPT received debug1: Authentications that can continue: gssapi-keyex,gssapi-with-mic,publickey,password,keyboard-interactive debug1: Next authentication method: publickey debug1: Offering RSA public key: /home/pirat9/.ssh/id_rsa debug1: Authentications that can continue: gssapi-keyex,gssapi-with-mic,publickey,password,keyboard-interactive debug1: Trying private key: /home/pirat9/.ssh/id_dsa debug1: Trying private key: /home/pirat9/.ssh/id_ecdsa debug1: Next authentication method: keyboard-interactiv
pirat9@solaris11:~$ uname -a SunOS solaris11 5.11 snv_151a i86pc i386 i86pc Solaris pirat9@solaris11:~$
