Mailinglist Archive: opensuse (1487 mails)

[Adam Tauno Williams <awilliam@xxxxxxxxxxxxx>]

On Sun, 2010-08-01 at 20:18 +0300, HG wrote:
> > > > Just upgraded my home server to 11.3. Normal mode for it is headless,
> > > > but I cannot seem to get X to work over ssh. I really don't know where
> > > > to look. So, here is what I have.
> > > > I enabled sshd at the install phase (opened the firewall, but
> > > > currently firewall is disabled altogether). Only change I did for the
> > > > /etc/ssh/sshd_config was to add "AllowGroups ssh_users" (which
> > > > includes me). Otherwise I noted that it already has "X11Forwarding
> > > > yes"
> > > > I login to the system from OS X or another older openSUSE with
> > > > > ssh -X 192.168.1.2
> > > > from OS X, I get this warning from both the new 11.3 as well as the
> > > > old openSUSE:
> > > > Warning: untrusted X11 forwarding setup failed: xauth key data not 
> > > > generated
> > > > Warning: No xauth data; using fake authentication data for X11 forwarding.
> > > > However, that doesn't appear if I log in from the older openSUSE and
> > > > it doesn't seem to matter much as form the old server, this works
> > > > great:
> > > > > xclock &
> > > > However, from the new 11.3, all I get is "Error: Can't open display: "
> > > > What is wrong with the sshd in 11.3? How to fix this?
> > > Ok, so I really don't know what is wrong, but fix was this... first
> > > let's go back a little. I wrote that this is clean installation with
> > > minimum changes. Well, one of the change was that in Global Network
> > > settings, I removed the tick mark from "Enable IPv6" as the help said:
> > > "To disable IPv6, uncheck this option (...). If the IPv6 protocol is
> > > not used on your network, the response time can be faster."
> > > Well, AFAIK, I'm not using IPv6 and I think that my router is not
> > > supporting it (although, it might). However, seems that while SSH was
> > > completely fine otherwise working without IPv6, the X forwarding
> > > didn't work. Why? I have no idea. But that was the fix: I enabled it,
> > > rebooted and X started to work over SSH just as it should
> > I have IPv6 disabled on 11.3 and on 11.1 on different machine and have
> > no problem with X forwarding (ssh -Y ...).
> > One thing I noticed quite some time ago (I guess, it was 11.1) that
> > when you disable IPv6 through Global Network Settings in Yast, the
> > file /etc/hosts still have some IPv6 definitions for local hosts and
> > some others.
> > This caused some problems until I removed these entries from
> > /etc/hosts manually.
> I suspect that this is the case with 11.3 too. I was checking the
> hosts file and as I saw the IPv6 addresses there, I remembered that I
> had disabled that and therefore went and enabled it again. So,
> basically I think that disabling IPv6 breaks things and causes bugs to
> show, but I don't know why or how... I just leave it on for now.

Which is the correct solution - if a fix is to disable IPv6 then the fix
is broken.  

If X forwarding doesn't work with IPv6 enabled the better solution is to
figure out why.

Do both machines have IPv6 addresses? `ip -6 addr`
Can the machines ping each other's IPv6 addresses? `ping6
fdb5:60da:9b8a:1:250:56ff:fea8:27e2`  [assuming they are on the same
subnet]

If not then something is broken.

Are the firewalls blocking IPv6 traffic - generally they should mirror
the IPv4 configuration?
-- 
Adam Tauno Williams <awilliam@xxxxxxxxxxxxx> LPIC-1, Novell CLA
<http://www.whitemiceconsulting.com>
OpenGroupware, Cyrus IMAPd, Postfix, OpenLDAP, Samba

-- 
To unsubscribe, e-mail: opensuse+unsubscribe@xxxxxxxxxxxx
For additional commands, e-mail: opensuse+help@xxxxxxxxxxxx