[Gllug] Ssh Debugging

[Dimitrios Siganos]

Hi Mick,

There is nothing unsual about a server binding to IP address "0.0.0.0"
The zero IP address, in that context, simply means "any". In other
words, the server is happy to receive incoming requests from any interface.

The real error is this:
Bind to port 1234 on 0.0.0.0 failed: Address already in use.

It means that another program is already using TCP port 1234. When it
says address, it means the combination of port and address.

To find out who holds port 1234, do:
netstat -tanp|grep 1234

Regards,
Dimitrios Siganos

On 25/02/12 20:44, Mick Farmer 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               /"\                      
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