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From: jdanskinner on 22 Feb 2007 19:11
I'm using SuSE 8.1 as server.

All was working properly this noon.
Sometime this afternoon attempted logins from
remote or loop back from console cause hang.

I found nothing helpful in the logs but I did run
sshd with -d -d -d startup.

I got the following log

1752: debug1: sshd version OpenSSH_3.4p1
1752: debug3: Not a RSA1 key file /etc/ssh/ssh_host_rsa_key.
1752: debug1: read PEM private key done: type RSA
1752: debug1: private host key: #0 type 1 RSA
1752: debug3: Not a RSA1 key file /etc/ssh/ssh_host_dsa_key.
1752: debug1: read PEM private key done: type DSA
1752: debug1: private host key: #1 type 2 DSA
1752: Disabling protocol version 1. Could not load host key
1752: debug1: Bind to port 22 on ::.
1752: Server listening on :: port 22.
1752: debug1: Server will not fork when running in debugging mode.
1752: Connection from ::ffff:24.159.192.106 port 2484
1752: debug1: Client protocol version 2.0; client software version
OpenSSH_3.4p1
1752: debug1: match: OpenSSH_3.4p1 pat OpenSSH*
1752: Enabling compatibility mode for protocol 2.0
1752: debug1: Local version string SSH-2.0-OpenSSH_3.4p1
1752: debug2: Network child is on pid 1753
1752: debug3: preauth child monitor started
1752: debug3: mm_request_receive entering
1753: debug3: privsep user:group 71:65
1753: debug1: list_hostkey_types: ssh-rsa,ssh-dss
1753: debug3: mm_request_send entering: type 20
1752: debug3: monitor_read: checking request 20
1753: debug3: mm_ssh_gssapi_server_ctx: waiting for
MONITOR_ANS_GSSSETUP
1753: debug3: mm_request_receive_expect entering: type 21
1753: debug3: mm_request_receive entering


I assume it must be a corrupt file someplace, but having no luck
finding
it.

I can ssh from the server to another server and
I can telnet to the server in questions.

Any suggestions appreciated.

Regards...Dan.

From: trryhend on 22 Feb 2007 21:52
On Feb 22, 6:11 pm, "jdanskinner" <JDanSkin...(a)JDanSkinner.com> wrote:
> I'm using SuSE 8.1 as server.
>
> All was working properly this noon.
> Sometime this afternoon attempted logins from
> remote or loop back from console cause hang.
>
> I found nothing helpful in the logs but I did run
> sshd with -d -d -d startup.
>
> I got the following log
>
> 1752: debug1: sshd version OpenSSH_3.4p1
> 1752: debug3: Not a RSA1 key file /etc/ssh/ssh_host_rsa_key.
> 1752: debug1: read PEM private key done: type RSA
> 1752: debug1: private host key: #0 type 1 RSA
> 1752: debug3: Not a RSA1 key file /etc/ssh/ssh_host_dsa_key.
> 1752: debug1: read PEM private key done: type DSA
> 1752: debug1: private host key: #1 type 2 DSA
> 1752: Disabling protocol version 1. Could not load host key
> 1752: debug1: Bind to port 22 on ::.
> 1752: Server listening on :: port 22.
> 1752: debug1: Server will not fork when running in debugging mode.
> 1752: Connection from ::ffff:24.159.192.106 port 2484
> 1752: debug1: Client protocol version 2.0; client software version
> OpenSSH_3.4p1
> 1752: debug1: match: OpenSSH_3.4p1 pat OpenSSH*
> 1752: Enabling compatibility mode for protocol 2.0
> 1752: debug1: Local version string SSH-2.0-OpenSSH_3.4p1
> 1752: debug2: Network child is on pid 1753
> 1752: debug3: preauth child monitor started
> 1752: debug3: mm_request_receive entering
> 1753: debug3: privsep user:group 71:65
> 1753: debug1: list_hostkey_types: ssh-rsa,ssh-dss
> 1753: debug3: mm_request_send entering: type 20
> 1752: debug3: monitor_read: checking request 20
> 1753: debug3: mm_ssh_gssapi_server_ctx: waiting for
> MONITOR_ANS_GSSSETUP
> 1753: debug3: mm_request_receive_expect entering: type 21
> 1753: debug3: mm_request_receive entering
>
> I assume it must be a corrupt file someplace, but having no luck
> finding
> it.
>
> I can ssh from the server to another server and
> I can telnet to the server in questions.
>
> Any suggestions appreciated.
>
> Regards...Dan.

Did someone change a NIC?

From: jdanskinner on 22 Feb 2007 22:54
On Feb 22, 8:52 pm, "trryh...(a)gmail.com" <trryh...(a)gmail.com> wrote:
> On Feb 22, 6:11 pm, "jdanskinner" <JDanSkin...(a)JDanSkinner.com> wrote:
>
>
>
> > I'm using SuSE 8.1 as server.
>
> > All was working properly this noon.
> > Sometime this afternoon attempted logins from
> > remote or loop back from console cause hang.
>
> > I found nothing helpful in the logs but I did run
> > sshd with -d -d -d startup.
>
> > I got the following log
>
> > 1752: debug1: sshd version OpenSSH_3.4p1
> > 1752: debug3: Not a RSA1 key file /etc/ssh/ssh_host_rsa_key.
> > 1752: debug1: read PEM private key done: type RSA
> > 1752: debug1: private host key: #0 type 1 RSA
> > 1752: debug3: Not a RSA1 key file /etc/ssh/ssh_host_dsa_key.
> > 1752: debug1: read PEM private key done: type DSA
> > 1752: debug1: private host key: #1 type 2 DSA
> > 1752: Disabling protocol version 1. Could not load host key
> > 1752: debug1: Bind to port 22 on ::.
> > 1752: Server listening on :: port 22.
> > 1752: debug1: Server will not fork when running in debugging mode.
> > 1752: Connection from ::ffff:24.159.192.106 port 2484
> > 1752: debug1: Client protocol version 2.0; client software version
> > OpenSSH_3.4p1
> > 1752: debug1: match: OpenSSH_3.4p1 pat OpenSSH*
> > 1752: Enabling compatibility mode for protocol 2.0
> > 1752: debug1: Local version string SSH-2.0-OpenSSH_3.4p1
> > 1752: debug2: Network child is on pid 1753
> > 1752: debug3: preauth child monitor started
> > 1752: debug3: mm_request_receive entering
> > 1753: debug3: privsep user:group 71:65
> > 1753: debug1: list_hostkey_types: ssh-rsa,ssh-dss
> > 1753: debug3: mm_request_send entering: type 20
> > 1752: debug3: monitor_read: checking request 20
> > 1753: debug3: mm_ssh_gssapi_server_ctx: waiting for
> > MONITOR_ANS_GSSSETUP
> > 1753: debug3: mm_request_receive_expect entering: type 21
> > 1753: debug3: mm_request_receive entering
>
> > I assume it must be a corrupt file someplace, but having no luck
> > finding
> > it.
>
> > I can ssh from the server to another server and
> > I can telnet to the server in questions.
>
> > Any suggestions appreciated.
>
> > Regards...Dan.
>
> Did someone change a NIC?

On the server, no.
No hardware or software changes for several weeks.
Regards...Dan.

From: Sebastian Volke on 23 Feb 2007 03:27
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

jdanskinner said the following on 23.02.2007 01:11:
| [...]
|
| I found nothing helpful in the logs but I did run
| sshd with -d -d -d startup.
|
| I got the following log
|
| 1752: debug1: sshd version OpenSSH_3.4p1
| 1752: debug3: Not a RSA1 key file /etc/ssh/ssh_host_rsa_key.
| 1752: debug1: read PEM private key done: type RSA
| 1752: debug1: private host key: #0 type 1 RSA
| 1752: debug3: Not a RSA1 key file /etc/ssh/ssh_host_dsa_key.
| 1752: debug1: read PEM private key done: type DSA
| 1752: debug1: private host key: #1 type 2 DSA
| 1752: Disabling protocol version 1. Could not load host key
| [...]

These files, sshd is complaining about, /etc/ssh/ssh_host_rsa_key and
/etc/ssh/ssh_host_dsa_key, do they exist?
As far as I can read those logs, your sshd disables protocoll version 1
because he misses the host keys, i.e. the files named above.
Now, if you try logging in using protocoll version 1, this may cause the
hang, but I can't say that for sure. That's certainly not the problem,
if your ssh-client uses protocoll 2.
But, maybe creating the host keys, or at least one of them, solves the
misbehaving.


- --
*Sebastian Volke*
registered Linux user #426550

mail address: echo ozslxhmfw_gfxyn(a)lrc.sjy | perl -pe 'y/a-z/v-za-w/'
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From: J.O. Aho on 23 Feb 2007 04:00
Sebastian Volke wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> jdanskinner said the following on 23.02.2007 01:11:
> | [...]
> |
> | I found nothing helpful in the logs but I did run
> | sshd with -d -d -d startup.
> |
> | I got the following log
> |
> | 1752: debug1: sshd version OpenSSH_3.4p1
> | 1752: debug3: Not a RSA1 key file /etc/ssh/ssh_host_rsa_key.
> | 1752: debug1: read PEM private key done: type RSA
> | 1752: debug1: private host key: #0 type 1 RSA
> | 1752: debug3: Not a RSA1 key file /etc/ssh/ssh_host_dsa_key.
> | 1752: debug1: read PEM private key done: type DSA
> | 1752: debug1: private host key: #1 type 2 DSA
> | 1752: Disabling protocol version 1. Could not load host key
> | [...]
>
> These files, sshd is complaining about, /etc/ssh/ssh_host_rsa_key and
> /etc/ssh/ssh_host_dsa_key, do they exist?
> As far as I can read those logs, your sshd disables protocoll version 1
> because he misses the host keys, i.e. the files named above.
> Now, if you try logging in using protocoll version 1, this may cause the
> hang, but I can't say that for sure. That's certainly not the problem,
> if your ssh-client uses protocoll 2.
> But, maybe creating the host keys, or at least one of them, solves the
> misbehaving.

There should be noted that it's not advised to use protocol 1 at all, as it's
an easy way in for people who aren't supposed to have access on your system.
Always disable protocol 1 on ssh and use only protocol 2

#from /etc/ssh/sshd_config
Protocol 2

--

//Aho
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