[GTALUG] Lightdm "Secure Remote connection"
William Park
opengeometry at yahoo.ca
Sun Feb 7 14:25:15 UTC 2016
1. You may need to configure the remote Lightdm to accept incoming XDMCP
connection. If
X -query 192.168.0.105
works, then it's accepting. Search for "XDMCP" keyword.
2. Check the firewall on port 177 and 6000-6010. No need, if #1 works.
:-)
3. Now, encryption part... I don't know what "Secure Remote Connection"
means. It could mean port forwarding via SSH (-X or -Y option). Or, it
could mean some new features of Lightdm, in which case, check its config
file.
--
William
On Sun, Feb 07, 2016 at 01:59:26PM -0500, Giles Orr wrote:
> Lightdm offers as one of the options at the login screen, a "Secure
> Remote connection" (this is on Debian jessie). If this is selected,
> you enter a username and password as usual, and when you click "Log
> in" it asks for a "host:port" combination. I haven't used this
> before, so I guessed that 192.168.0.105:22 (a valid machine on my
> network) would be appropriate. After some cogitation and a bit of
> screen flashing, this returns to the login prompt.
>
> What settings do I need locally and remotely for this to work? Where
> should I look for errors? Any thoughts?
>
> A bunch of points that may help:
> - ssh is installed on both machines, sshd is running and remote logins
> work both ways
> - the lightdm and lightdm-gtk-greeter packages are installed on both machines
> - the remote machine is running Ubuntu trusty
> - the remote user I'm trying to connect as is already running a local
> X session on the remote machine: I'm assuming that doesn't matter?
> - wireshark and the hard-to-read logs in /var/log/lightdm/ (on both
> ends of the connection) suggest that ssh connects properly and X
> starts ... and then fails, but I'm not clear on why. Nor am I totally
> sure I'm reading this right
>
> - this feature appears to be totally undocumented: the interface
> explains nothing, there's nothing in the man page, and even Google
> knows nothing ... I even resorted to code diving, but "Secure Remote
> connection" isn't in there. It's also not anywhere in /etc/ where I
> would have expected to find it if it was an option configured by
> Debian (although it could be under /usr/ ... I haven't done a grep of
> that entire tree ...)
>
> Thanks for any assistance.
>
> --
> Giles
> http://www.gilesorr.com/
> gilesorr at gmail.com
> ---
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