[Gllug] Ssh Debugging

[JLMS]

On 27 February 2012 23:51, JLMS <jjllmmss at googlemail.com> wrote:
> On 25 February 2012 20:44, Mick Farmer <mick at dcs.bbk.ac.uk> wrote:
>> Dear GLLUGers,
>>
>> I've recently upgraded to FTTC from Plusnet and now get 20+
>> Mbps download speeds.
>>
>> The downside appears to be that my ssh link to my work
>> machine goes down five or six times a day.  So, I'm trying
>> to run sshd in debug mode on my work machine.  However, this
>> is what I get.
>>
>> [root at penguin log]# /usr/sbin/sshd -d -p 1234
>> debug1: sshd version OpenSSH_3.9p1
>> debug1: private host key: #0 type 0 RSA1
>> debug1: read PEM private key done: type RSA
>> debug1: private host key: #1 type 1 RSA
>> debug1: read PEM private key done: type DSA
>> debug1: private host key: #2 type 2 DSA
>> debug1: rexec_argv[0]='/usr/sbin/sshd'
>> debug1: rexec_argv[1]='-d'
>> debug1: rexec_argv[2]='-p'
>> debug1: rexec_argv[3]='1234'
>> debug1: Bind to port 1234 on ::.
>> Server listening on :: port 1234.
>> debug1: Bind to port 1234 on 0.0.0.0.
>> Bind to port 1234 on 0.0.0.0 failed: Address already in use.
>> Generating 768 bit RSA key.
>> RSA key generation complete.
>>
>> Presuably this means that the server is using a default IP
>> address of 0.0.0.0.  How can I overcome this?  Or is there
>> another error waiting in the wings?
>>
>> Your help is appreciated.
>>
>> Regards,
>>
>> Mick               /"\
>
> I ran the command above on my server and the same IPv4 address
> (0.0.0.0) is used, successfully
>
> Did you take the message at its word? Could it be that unknown to you
> there is something else in port 1234? (some quarters report that
> starting sshd for both IPv6 & IPv4 confuses things, it seems disabling
> IPv6 works in some instances where this is doable)

Forgot to add a link to a discussion of this matter which seems
useful: http://blog.wains.be/2006/03/30/howto-fix-bind-to-port-22-on-0000-failed-address-already-in-use-error/
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