SSH problem to access Connection refused

miros84 · 01-14-2013, 03:10 AM

Hi,
I try to access from PC A to PC B and I have got this problem:

Code:

user@user-D:~$ ssh -p 1001 user@10.10.10.101
ssh: connect to host 10.10.10.101 port 1001: Connection refused

What I did is:

1. Installed ssh in both computers. (ssh, openssh-client, openssh-server)
2. In computer B: Open port 1001 in redirect it to computer B in router (NAT settings)
3. Try accesgin computer B this way:
4. Do a ping from PC A to PC B ping 10.10.10.101 and PING is OK

Code:

ssh -p 1001 user@10.10.10.101

where 10.10.10.101 is an example of the public IP of computer B

And error is:

Code:

Connection refused

Any idea?

seeberg · 01-14-2013, 04:46 AM

On PC B the computer you want to access you forgot to configure SSH to use port 1001. Standard port is 22 you have to change it in /etc/ssh/sshd_config.

Good tools to use if you want to find errors in your setup is: nmap, netstat, and syslog.

miros84 · 01-14-2013, 04:54 AM

Yes, you are right. I didnot do that. I will change it and tell if it works.

miros84 · 01-14-2013, 07:24 AM

I tried editing

Code:

/etc/ssh/sshd_config.

but it doesnot work.

Other ideas? What could be wrong?

rocq · 01-14-2013, 08:10 AM

Hi,

1) Check your firewall with "iptables -L" and flush it if needed ("iptables -F")
2) Check if the ssh deamon is actually listening on the port you configured: "netstat -nap | grep sshd"
3) Does the user exist on PC B?

TobiSGD · 01-14-2013, 08:23 AM

Quote:

Originally Posted by miros84

I tried editing

Code:

/etc/ssh/sshd_config.

but it doesnot work.

Other ideas? What could be wrong?

Have you restarted the SSH daemon after changing the configuration?

miros84 · 01-14-2013, 08:33 AM

First, thank you for your help.

Here is the what I just did.

Code:

root@cserver:/mnt/nasserver# iptables -L
Chain INPUT (policy ACCEPT)
target     prot opt source               destination         

Chain FORWARD (policy ACCEPT)
target     prot opt source               destination         

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination         
root@cserver:/mnt/nasserver# netstat -nap | grep sshd
tcp        0      0 0.0.0.0:1001            0.0.0.0:*               LISTEN      2953/sshd       
tcp6       0      0 :::1001                 :::*                    LISTEN      2953/sshd       
root@cserver:/mnt/nasserver# sudo /etc/init.d/ssh restart
[ ok ] Restarting OpenBSD Secure Shell server: sshd.
root@cserver:/mnt/nasserver#

I can try if it works few hours later, but I just try by andorid - ConectBot
and I have got the same error.

miros84 · 01-14-2013, 08:39 AM

One point more.
In my router in:

Advanced setup >> NAT >>
I have 2 things:

1. Virtual Servers
2. Port triggering

Which one is need to be configured for SSH?
Pictures of router settings here.

TobiSGD · 01-14-2013, 09:37 AM

The NAT - Virtual Server settings are the ones you have to set up correctly. In your first post you use port 1001, but according to the output of netstat your sshd is listening on port 2953, have you set up that correctly in your router?

miros84 · 01-14-2013, 09:42 AM

Hi TobiSGD,

I was configured port triggering.
Now I configured virtual services and now it works.
I tried with virtual services correctly configured before, but I didnot restart ssh deamon.
Now it works Ok.I tried it with android and it works. Thank you very much.

About sshd is listening on port 2953, I have not idea. I didnot toush that. But I will not edit that, because now it works.

BTW, when I try editing /etc/ssh/sshd_config with gedit, it desnot want to. With nano no problem. Do you know why?

TobiSGD · 01-14-2013, 09:45 AM

Usually this is a permission problem, try to start gedit with gksu (dependend on which distribution and DE you use this may also be gksudo, kdesu, kdesudo, sux, ...).

miros84 · 01-14-2013, 09:52 AM

Look the error:

Code:

root@cserver:/home/user# gedit /etc/ssh/sshd_config

(gedit:5912): EggSMClient-WARNING **: Failed to connect to the session manager: None of the authentication protocols specified are supported


** (gedit:5912): WARNING **: Could not connect to session bus

How to do it with gksu? I use gnome. And gedit is installed and works with other files.
I did it as root.

TobiSGD · 01-14-2013, 10:02 AM

Try it with

Code:

gksu gedit /etc/ssh/sshd_config

from a non-root terminal.

miros84 · 01-14-2013, 10:10 AM

Yes, that's the problem.

I tried it in non root terminal and it works. Promt me a input to set the password and that's ok.

But when I try in root terminal it doesnot work. I dont understand the problem.
If root has permision to all files and directories? What really happend? Why Linux doesnot let me edit it?

TobiSGD · 01-14-2013, 10:36 AM

It would let you edit it, but it has problems to connect to the running X session (that is running as your user). This is the problem with most X applications you try to run as root, that is why things like gksu exist.