Well, my problem seems to be exactly opposite. If I restart sshd, I get
really good response at first and then it deteriorates to a several
second login delay. dig and dig -x is always fast. I even disabled
reverse DNS on sshd with no difference. Every once in a while I get
fast response. The sshd debug output doesn't show anything
interesting. This has been a real head-scratcher.
On 10/19/12 7:02 PM, Richard Elling wrote:
On Oct 19, 2012, at 3:51 PM, "Dan Swartzendruber" <[email protected]> wrote:
Hi, all. I've got an issue that is bugging me. I've got an OI 151a7 VM and
ssh to it takes 15 seconds or so, then I get a prompt. It's not the usual
reverse dns or gssapi stuff, since my backup node is also OI 151a7 and it
responds instantly to the ssh request.
15 seconds is a magic number -- the default timeout for a DNS lookup.
Use getent to verify that lookups (forward and reverse) are fast. Use nscd -i
to make sure the cached name lookups are flushed.
Another quick test, if the first ssh takes a while, but soon afterwards a second
completes quickly, then the nscd cache is working properly.
-- richard
Google has not turned up anything
useful except for the usual suspects that are innocent in this case. The
only hint I can see is if I give '-v' on the client, I see this:
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 nas [10.0.0.4] port 22.
debug1: Connection established.
debug1: identity file /home/dswartz/.ssh/id_rsa type -1
debug1: identity file /home/dswartz/.ssh/id_rsa-cert type -1
debug1: identity file /home/dswartz/.ssh/id_dsa type -1
debug1: identity file /home/dswartz/.ssh/id_dsa-cert type -1
debug1: identity file /home/dswartz/.ssh/id_ecdsa type -1
debug1: identity file /home/dswartz/.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
(the delay is here)
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 8c:78:a0:17:6b:17:1b:bf:83:69:a3:bf:59:df:18:07
debug1: Host 'nas' is known and matches the RSA host key.
debug1: Found key in /home/dswartz/.ssh/known_hosts:9
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:
publickey,password,keyboard-interactive
debug1: Next authentication method: publickey
debug1: Trying private key: /home/dswartz/.ssh/id_rsa
debug1: Trying private key: /home/dswartz/.ssh/id_dsa
debug1: Trying private key: /home/dswartz/.ssh/id_ecdsa
debug1: Next authentication method: keyboard-interactive
Any thoughts where to look? It's got to be something that is different
between the two OI hosts, but offhand, I'm not sure where to look.
Thanks...
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