HOWTO: Use NXclient to remotely control Ubuntu

[Princey]

Thanks for the guide. It worked perfectly using the settings suggested. However, when I changed my port as I wanted to move away from port 22, I keep getting an error message from my laptop saying authentification failed. Of course, I'm trying this from home before I leave for work. The machine I want to control is my desktop server/workstation.

My problem is with ssh however, as everything has been changed even I follow your steps to the letter. Say I changed to 55555 as you stated, I connect but get an authentification error. Testing on the machine where nxserver is installed, I get this error:

ssh localhost
ssh: connect to host localhost port 22: Connection refused

My port has been changed in /etc/ssh/sshd_config

[A$h X]

Try this:

sudo gedit /etc/ssh/ssh_config

and change

# Port 22

to

Port 55555

where 55555 is whatever port you chose. Hopefully sorts out your problems.

[Inxsible]

Changing the port works on mine, are you sure you have created a rule in firestarter and changed the port in NXclient? Make sure the port value is the same in all four (SSHD_config, server.cfg, and firestarter on the server, and NXclient's target port on the remote computer).

hansonlee: I'm trying to find more info on your problem, googling your error ID draws a blank, in the mean time trying deleting your user and re-adding them to see if it helps. Or create another system user, then add them as a SSH and NXserver user.

Hi Ash,
Yeah I did change the ports everywhere that it was required viz sshd_config, server.cfg, firestarter, my router(i.e.port forwarding) and finally in the nx client on my other PC.

Gotta get this thing working. Now its ******* me off !!!!

[Inxsible]

the server.cfg file has two places

# Specify the TCP port where the NX server SSHD daemon is running.
#
SSHDPort = "22"

and

#
# Specify the TCP port where the SSHD daemon is running on the NX SSH
# authentication server.
#
SSHDAuthPort = "22"

So my question is do we have to change both to a different port?

I was only changing the SSHDAuthPort until now. Maybe that's the problem. Also we do have to KEEP the quotes right ? Just checking...

[A$h X]

Yeah, change both instances of the port and keep the quotes. Try that and if it's STILL not working then try changing ssh_config as mentioned two posts earlier. But only change one file at a time so we can isolate the problem.

[Inxsible]

SUCCESS !!!!

I was finally able to connect after changing the port. But I did have to change the port in the server.cfg at both the places that I mentioned before.

Thanks A$h X for all your help !!!

[A$h X]

Good to hear. Now anyone having the same problem will know what to do. I'll update the guide to show the port number in server.cfg needs to be changed in two different places.
Also Princey, I suspect this will also solve your problem.

[Princey]

A$h X, my problem is identical to Inxsible. I've now changed the two instances in the server.cfg file. A question though, I see for both instances that the "#" sign appears in front of them. To my limited knowledge, normally that symbol comments out the line. Do I leave it or remove it? In other words, should it read 1.

#SSHDAuthPort = 55555

still using your port example or 2.

SSHDAuthPort =55555

[Inxsible]

No, you have to remove the # sign. As you said, Ubuntu ignores everything on the line after a #

[A$h X]

If a line has a # in front then as you say, ubuntu ignores it. You must delete the # to apply the changes.
The # is present as port 22 is default, so SSH knows where to look already. If you uncomment it, then a value must be defined. Get rid of it and put your port number and it should be working fine.