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@gmail.com --- Talk Mailing List talk@gtalug.org https://gtalug.org/mailman/listinfo/talk