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Re: help with ssh ?



Kevin Kempter wrote:
Hi List;

I have a machine I want to ssh to with no passwd. I've done this on my local fedora 7 box:

$ ssh-keygen -t dsa -f .ssh/id_dsa
$ cd .ssh
$ scp id_dsa.pub user remote:~/.ssh/id_dsa.pub


Then I connected to the remote box and did this:

$ ssh user remote
[remote-box] $ cd .ssh

[remote-box] $ cat id_dsa.pub >> authorized_keys2
[remote-box] $ chmod 640 authorized_keys2
[remote-box] $ rm id_dsa.pub
[remote-box] $ exit

The scp took like 5min

Then I try and connect like this (remote box is 172.16.128.128) :

$ ssh -v 172.16.128.128

and I get this:
OpenSSH_4.5p1, OpenSSL 0.9.8b 04 May 2006
debug1: Reading configuration data /home/kkempter/.ssh/config
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: Applying options for *
debug1: Connecting to 172.16.128.128 [172.16.128.128] port 22.
debug1: Connection established.
debug1: identity file /home/kkempter/.ssh/identity type -1
debug1: identity file /home/kkempter/.ssh/id_rsa type 1
debug1: identity file /home/kkempter/.ssh/id_dsa type 2
debug1: Remote protocol version 1.99, remote software version OpenSSH_4.6
debug1: match: OpenSSH_4.6 pat OpenSSH*
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_4.5
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug1: kex: server->client aes128-cbc hmac-md5 none
debug1: kex: client->server aes128-cbc 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: Host '172.16.128.128' is known and matches the RSA host key.
debug1: Found key in /home/kkempter/.ssh/known_hosts:13
debug1: ssh_rsa_verify: signature correct
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug1: SSH2_MSG_NEWKEYS received
debug1: SSH2_MSG_SERVICE_REQUEST sent
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug1: Authentications that can continue: publickey,password
debug1: Next authentication method: publickey
debug1: Trying private key: /home/kkempter/.ssh/identity
debug1: Offering public key: /home/kkempter/.ssh/id_rsa

At this point ssh hangs for like 4 or 5 minutes, then I get this:

debug1: Server accepts key: pkalg ssh-dss blen 433
debug1: read PEM private key done: type DSA
debug1: Authentication succeeded (publickey).
debug1: channel 0: new [client-session]
debug1: Entering interactive session.
debug1: Sending environment.
debug1: Sending env LANG = en_US.UTF-8
Last login: Tue Sep  4 16:26:13 2007 from 172.16.128.1

Then it hangs again for another 2 - 3 minutes and finally I get a prompt.

the remote box is a windows XP box in vmware on my local fedora box running cygwin

Any thoughts?


Almost a certainty that is a DNS issue.  Whenever ssh hangs like that
with no error, it is almost always is DNS on the system you are trying
to log into.

ssh tries very hard to be a good citizen and allow updates to utmp
and wxtmp databases, which require FQDNS names.

You can tell quite simply if this is the case.

After the LONG pause to get logged in, do:

$ w
or
$ who

That is the old BSD style who program, that by default shows
the host name for remote logins.  If your session lists the IP Address
instead of the host name, you know for sure that the DNS reverse name
lookup for that login session failed.

Most DNS failures for ssh are set at about 120 seconds by default.

Good Luck!


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