On 17 December 2016 at 23:52, Eric Smith <spacewar@xxxxxxxxx> wrote:
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I have F24 on my laptop (vaio), and F25 on my desktop (p1). Back when both ran F24, I could from the laptop do "ssh -X p1" to get an ssh session with X forwarding. Now that I've upgraded the desktop to F25, when I try to do that, I get the ssh session, but with an error "X11 forwarding request failed on channel 0", and the DISPLAY environment variable is not set, whereas before it would be set to "localhost:10.0".
Running the sshd server with debugging shows that the problem is with binding the X11 forwarding ports (6010 and up);
debug3: receive packet: type 98
debug1: server_input_channel_req: channel 0 request x11-req reply 1
debug1: session_by_channel: session 0 channel 0
debug1: session_input_channel_req: session 0 req x11-req
debug3: sock_set_v6only: set socket 9 IPV6_V6ONLY
debug2: bind port 6010: Cannot assign requested address
debug3: sock_set_v6only: set socket 9 IPV6_V6ONLY
debug2: bind port 6011: Cannot assign requested address
...
and so on through port 7009
ifconfig on the desktop shows that I have an inet6 address on the Ethernet interface enp10s0 (which I don't actually want), but no inet6 address on lo. route shows that I have no ipv6 routes.
What do I need to change to get sshd to successfully bind a suitable port (e.g., 6010)?
Are you using wayland on the desktop? https://blogs.s-osg.org/wow-wayland-over-wire/ explains difficulties. The wayland FAQ discusses a number of possibilities for networking GUI apps under wayland. Running a VNC server on the desktop seems like
the least experimental option. I use it on SL7, which uses a similar systemd setup where a VNC server is started for each VNC
user: https://docs.fedoraproject.org/en-US/Fedora/25/html/System_Administrators_Guide/ch-TigerVNC.html
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George N. White III <aa056@xxxxxxxxxxxxxx>
Head of St. Margarets Bay, Nova Scotia
Head of St. Margarets Bay, Nova Scotia
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